PERMUTATIONS AND COMBINATIONS  by :  DR. T.K. JAIN AFTERSCHO ☺ OL  centre for social entrepreneurship  sivakamu veterinary...
My words..... My purpose here is to give a few questions on fundamentals of permutations and combinations.  I welcome your...
What is permutation & combination? Permutation = it denotes order / Sequence but combination = it only denotes that some o...
What is formula of permutation ?  Npr = n! / (n-r)! p=permutation n= total number of objects r=how many objects you are ta...
There are 5 books on maths, 3 on entrepreneurship and 2 on economics. In how many ways can we arrange them. We have to kee...
A court has given 6 to 3 decision in favaour of an issues. In how many ways can it reverse the decision?  There are 9 judg...
Three persons go into a room which has 8 seats, in how many ways can they occupy the seats ?  First person has 8 options, ...
There are 5 routes between Bikaner and Delhi. You may choose any route. In how many ways can you go and return from Delhi?...
How many permutations are possible from ACCOUNTANT ?  There are 10 digits, there are 2A, 2C, 2T, 2N, so we have :  10! / (...
How many different 4 digit letters can you make out of A,B,C,D,E?  N = 5 (A,B,C,D,E)  R = 4  formula =  Npr = n! / (n-r)! ...
How many different 4 digit numbers can you make out of 1,2,3,4,0?  N = 5 (1,2,3,4,0)  R = 4  but 0 cannot come in the firs...
contd..... If it is not 0, permutation will be :  formula = Npr = n! / (n-r)! =5!/(5-4)!  = 120  Zero fixed for 1 st  poti...
How many different 4 digit numbers can you make out of 1,2,3,4,0 which are divisible by 2?  Start with 96 of the last ques...
In how many ways can Raj invite any 3 of his 7 friends?  This is a question of combination. Here order (sequence) is not i...
How many different words can you frame from FUTURE ?  Here we have two U total we have 6 digits.  Formula : N ! / L! N= to...
How many different words can you frame from DALDA ?  Here we have two D & A total we have 5 digits.  Formula : N ! / L! N=...
In how many ways can 8 person sit around a round table ?  For questions relating to round table , we have to use the follo...
How many 4 digit numbers can be formed out of 1,2,3,5,7,8,9  if no digit is repeated. Total number ofdigits = 7 formula = ...
How many numbers greater than 2000 can be formed from 1,2,3,4,5. No repeatition is allowed. 5 digit numbers = 5! = 120  4 ...
There are 6 books on english, 3 on maths, 2 on GK. In how many ways can they be placed in shelf, if books of 1 subject are...
How many words can we make out of DRAUGHT, the vowels are never separated?  Number of vowels = 2 other digits = 5  we will...
In how many ways can 8 pearls be used to form a necklace ? In questions of necklace, we use the following formula : ½ (N-1...
In how many number of ways can 7 boys form a ring ?  (7-1) ! = 6! = 720 answer
50 different jewels can be set to form necklace in how many ways ?  ½ ( n -1) ! = ½ (50 -1)! =1/2 (49)!
How many number of different digits can be formed from 0,2,3,4,8,9 between 10 to 1000?  Let us assume that repeatition is ...
What is the number of permutations of 10 different things taking 4 at a time in which one thing never comes  ? = 9 p 4 = (...
There are 5 speakers (A,B,C,D,E) , in how many ways can we arrange their speach that A always speaks before B For A and th...
5 persons are sitting in a round table  in such a way that the tallest person always sits next to the smallest person?  Ke...
How many words can be formed from MOBILE so that consonent always occupies odd place ?  There are 3 odd and 3 even places....
In how many ways can we arrange 6 + and 4 – signs so that no two – signs are together?  + + + + + + there are 5 places bet...
There are 10 buses between Bikaner and Jaipur. In how many ways can Gajendra go to Jaipur and come back without using the ...
In how many ways can yamini distribute 8 sweets to 8 persons provided the largest sweet is served to Jigyasha?  1 sweet is...
Yamini &  Jigyasha go to a train and they find 6 vacant seats. In how many ways can they sit?  Yamini has 6 options but Ji...
How many words can you make from DOGMATIC?  8!  40320 answer
Gajendra has 12 friends out of whom 8 are relatives. In how many ways can he invite 7  in such a way that 5 are relatives?...
There are 8 points on a plane. No 3 points are on a straight line. How many traiangles can be made out of these ?  8c3 = 5...
In how many ways can you form a committee of 3 persons out of 12 persons ?  12c3  =220 answer
How many different factors are possible from 75600 ?  The factors are : 2^4* 3^3*5^2 *7 formula = (number of factors +1) (...
A box contains 7 red 5 white and 4 blue balls. How many selections can be made that we pick up 3 balls and all are red?  I...
A box contains 7 red 5 white and 4 blue balls. What is the probability that in our selections  we pick up 3 balls and all ...
What is the probability of getting 3 heads when I toss a coin 5 times?  This is a case of binomial probability (where ther...
In how many ways can Gajendra invite some or all of his 5 friends in party hosted by him? (at least 1)  Frmula of combinat...
How many words can be formed by using all the letters of the  word DRAUGHT so that a. vowels always come together & b. vow...
In how many ways can a cricket eleven be chosen out of a batch of 15 players. 15c11  =15! / ((15-11)!*11!) =15!/(4!*11!) =...
In how many  a committee of 5 members can be selected from 6 men 5 ladies consisting of 3 men and 2 ladies 6c3 *5c2  =[(6*...
How many 4-letter word with or without meaning can be formed out of the letters of the word 'LOGARITHMS' if repetition of ...
how many ways can the letter of word 'LEADER' be arranged We have two e, so divide 6p6 by 2 6!/2! =720 / 2 =360 answer
How many arrangements can be made out of the letters of the word 'MATHEMATICS' be arranged  so that the vowels always come...
In how many different ways can the letter of the word 'DETAIL' be arranged in such a way that the vowels occupy only the o...
How many 3 digit numbers can be formed from the digits 2,3,5,6,7  and 9 which are divisible by 5 and none of the digits is...
In how many ways can 21 books on English and 19 books on Hindi  be placed in a row on a self so that two books on Hindi ma...
Out of 7 constants and 4 vowels how many words of 3 consonants   and 2 vowels can be formed? Selection of 5 digits  =7c3 *...
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Download more resources  http://www.esnips.com/web/onlinespeeches
http://www.esnips.com/doc/a4161e7a-6859-4583-b3b9-fc8883819ca2/REASONING-QUIZ http://www.esnips.com/doc/292f3066-dfff-4507...
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THANKS.... GIVE YOUR SUGGESTIONS AND JOIN AFTERSCHOOOL NETWORK / START AFTERSCHOOOL SOCIAL ENTREPRENEURSHIP  NETWORK IN YO...
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Permutations and combinations

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Permutations and combinations

  1. 1. PERMUTATIONS AND COMBINATIONS by : DR. T.K. JAIN AFTERSCHO ☺ OL centre for social entrepreneurship sivakamu veterinary hospital road bikaner 334001 rajasthan, india FOR – PGPSE / CSE PARTICIPANTS [email_address] mobile : 91+9414430763
  2. 2. My words..... My purpose here is to give a few questions on fundamentals of permutations and combinations. I welcome your suggestions. I also request you to help me in spreading social entrepreneurship across the globe – for which I need support of you people – not of any VIP. With your help, I can spread the ideas – for which we stand....
  3. 3. What is permutation & combination? Permutation = it denotes order / Sequence but combination = it only denotes that some objects are together example : ABC can have only one combination taking all of them together. But permutations are many : - ABC,ACB,BCA,BAC,CBA,CAB
  4. 4. What is formula of permutation ? Npr = n! / (n-r)! p=permutation n= total number of objects r=how many objects you are taking at a time ! = multiply with reducing numbers till it reaches 1 example : 5p5 = 5! / (5-5)! 5!=5*4*3*2*1 0! = 1 thus answer = 120 answer
  5. 5. There are 5 books on maths, 3 on entrepreneurship and 2 on economics. In how many ways can we arrange them. We have to keep books of a subject together. There are 3 subjects so we can arrange them in 3! methods = 6 there are 5 books on maths , we have 5! methods = 120 there are 3 books on entrepreneurship , so we have 3! methods there are 2 books on economics , so we have 2! methods. Total we have : 6*120*6*2 = 8640 answer
  6. 6. A court has given 6 to 3 decision in favaour of an issues. In how many ways can it reverse the decision? There are 9 judges, 5 will make a majority there may be 5,6,7,8,9 judges against the issue we have 9c5 or 9c6 or 9c7 or 9c8 or 9c9 methods : 126 + 84+36+9+1 =256 answer
  7. 7. Three persons go into a room which has 8 seats, in how many ways can they occupy the seats ? First person has 8 options, 2 nd person has 7 options and 3 rd person has 6 options. Total = 8*7*6 = 336 answer
  8. 8. There are 5 routes between Bikaner and Delhi. You may choose any route. In how many ways can you go and return from Delhi? 5*5 = 25
  9. 9. How many permutations are possible from ACCOUNTANT ? There are 10 digits, there are 2A, 2C, 2T, 2N, so we have : 10! / (2!*2!*2!*2!) answer
  10. 10. How many different 4 digit letters can you make out of A,B,C,D,E? N = 5 (A,B,C,D,E) R = 4 formula = Npr = n! / (n-r)! =5!/(5-4)! = 120 answer
  11. 11. How many different 4 digit numbers can you make out of 1,2,3,4,0? N = 5 (1,2,3,4,0) R = 4 but 0 cannot come in the first digit for first digit we have 4 options (1,2,3,4), for next digits, we can use 0. thus we have 4*4*3*2*1 = 96 options OR formula = Npr = n! / (n-r)! =5!/(5-4)! but this contains all those numbers which start with 0. so let us keep 0 as fixed for 1 st digit and solve it. Now we have to pick up 3 digit out of 4 contd.
  12. 12. contd..... If it is not 0, permutation will be : formula = Npr = n! / (n-r)! =5!/(5-4)! = 120 Zero fixed for 1 st potion, we have these options : Npr = n! / (n-r)! n=4,r=3 4!/(4-3)! = 24 deduct this 24 from 120 120 -24 = 96 answer you can use any formula (out of these 2), you get the same answer
  13. 13. How many different 4 digit numbers can you make out of 1,2,3,4,0 which are divisible by 2? Start with 96 of the last question now pick up all those which are ending with 1 : 3*3*2*1 = 18 similarly those which are ending with 3 3*3*2*1 = 18 thus 96 – (18+18) = 60 seems to be the answer
  14. 14. In how many ways can Raj invite any 3 of his 7 friends? This is a question of combination. Here order (sequence) is not important, his friends can come in any order. Thus this is a case of combination. Formula : N! / ((n-r)!*r!) you can calculate combination by dividing permutation by r! =7! / ((7-3)!*3!) =(7*6*5)/(3*2*1) = 35 answer
  15. 15. How many different words can you frame from FUTURE ? Here we have two U total we have 6 digits. Formula : N ! / L! N= total number of digits L = those digits which are repeated. Answer = 6! / 2! = 360 answer
  16. 16. How many different words can you frame from DALDA ? Here we have two D & A total we have 5 digits. Formula : N ! / L! N= total number of digits L = those digits which are repeated. Answer = 5! / (2!*2!) = 30 answer
  17. 17. In how many ways can 8 person sit around a round table ? For questions relating to round table , we have to use the following formula : (n-1)! So here answer = (8-1)! = 7! =5040 answer
  18. 18. How many 4 digit numbers can be formed out of 1,2,3,5,7,8,9 if no digit is repeated. Total number ofdigits = 7 formula = Npr n =7 r 4 7p4 = 7! / 3! =7*6*5*4 = 840
  19. 19. How many numbers greater than 2000 can be formed from 1,2,3,4,5. No repeatition is allowed. 5 digit numbers = 5! = 120 4 digit numbers,: we cant take 1 in the beginning. We have 4 options for 1 st digit 4 for 2 nd digit 3 for 3 rd digit ... 4*4*3*2*1 = 96 total = 216 answer
  20. 20. There are 6 books on english, 3 on maths, 2 on GK. In how many ways can they be placed in shelf, if books of 1 subject are together? We have 3 subjects so 3! books of same subjects can be interchanged. So answer : 3!*6!*3!*2! =6*720*6*2 = 51840 answer
  21. 21. How many words can we make out of DRAUGHT, the vowels are never separated? Number of vowels = 2 other digits = 5 we will treat vowels as 1 word so we have 6!. Vowels can be interchanged so 2! so answer = 6!*2! = 1440 answer
  22. 22. In how many ways can 8 pearls be used to form a necklace ? In questions of necklace, we use the following formula : ½ (N-1)! Here we can take reverse order of left to right or right to left, so divide by ½ =1/2 (8-1)! =2520
  23. 23. In how many number of ways can 7 boys form a ring ? (7-1) ! = 6! = 720 answer
  24. 24. 50 different jewels can be set to form necklace in how many ways ? ½ ( n -1) ! = ½ (50 -1)! =1/2 (49)!
  25. 25. How many number of different digits can be formed from 0,2,3,4,8,9 between 10 to 1000? Let us assume that repeatition is not allowed Let us make 2 digit numbers : for first digit we have 5 option, for 2 nd digit also we have 5 options (including 0) = 25 for 3 digit numbers : 5*5*4 = 100 total 125 if repeatition is allowed : for 2 digit : 5 * 6 = 30 for 3 digit : 5*6*6 = 180 total = 210 answer
  26. 26. What is the number of permutations of 10 different things taking 4 at a time in which one thing never comes ? = 9 p 4 = (9*8*7*6) =3024
  27. 27. There are 5 speakers (A,B,C,D,E) , in how many ways can we arrange their speach that A always speaks before B For A and then B without gap : Let us take A and B as one. 4! = 24 for A and then B let us keep B at 3 rd place and A at 1 st place =3! there are total 6 such possibilities so we have 6*6 = 36 total possibilities = 60 answer
  28. 28. 5 persons are sitting in a round table in such a way that the tallest person always sits next to the smallest person? Keep tallest and smallest person as 1. we have (4-1)! = 6 the tallest and the smallest person can be interchanged = 2 =12
  29. 29. How many words can be formed from MOBILE so that consonent always occupies odd place ? There are 3 odd and 3 even places. We have 3! *3! =36 answer
  30. 30. In how many ways can we arrange 6 + and 4 – signs so that no two – signs are together? + + + + + + there are 5 places between 2 +. one on extreme left and one on extreme right. We have 7 positions for – sign 7c4 we have 6 places for 6 + sign, so we have 6c6 total = 35 answer
  31. 31. There are 10 buses between Bikaner and Jaipur. In how many ways can Gajendra go to Jaipur and come back without using the same bus in return journey? There are 10 options while going there are 9 options while returning (one bus used earlier will not be used) 10*9 = 90 answer
  32. 32. In how many ways can yamini distribute 8 sweets to 8 persons provided the largest sweet is served to Jigyasha? 1 sweet is fixed so we have 7! = 5040 answer
  33. 33. Yamini & Jigyasha go to a train and they find 6 vacant seats. In how many ways can they sit? Yamini has 6 options but Jigyasha has only 5 options left = 6*5 = 30 answer
  34. 34. How many words can you make from DOGMATIC? 8! 40320 answer
  35. 35. Gajendra has 12 friends out of whom 8 are relatives. In how many ways can he invite 7 in such a way that 5 are relatives? 8c5 * 4c2 =56*6 =336 answer
  36. 36. There are 8 points on a plane. No 3 points are on a straight line. How many traiangles can be made out of these ? 8c3 = 56 answer
  37. 37. In how many ways can you form a committee of 3 persons out of 12 persons ? 12c3 =220 answer
  38. 38. How many different factors are possible from 75600 ? The factors are : 2^4* 3^3*5^2 *7 formula = (number of factors +1) (number of factors +1) .... - 1 (4+1)(3+1)(2+1)(1+1) -1 =119 answer
  39. 39. A box contains 7 red 5 white and 4 blue balls. How many selections can be made that we pick up 3 balls and all are red? It is a question of combination. Total possibilities = 7c3 7c3 = 7*6*5 / 3*2*1 = 35 thus there are 35 chances of getting
  40. 40. A box contains 7 red 5 white and 4 blue balls. What is the probability that in our selections we pick up 3 balls and all are red? Total possibilities for red = 7c3 7c3 = 7*6*5 / 3*2*1 = 35 total possibility of 3 balls : 16c3 =(16*15*14/3*2*1) =560 probability - thus there are 35/560 chances of getting red in all the three selections
  41. 41. What is the probability of getting 3 heads when I toss a coin 5 times? This is a case of binomial probability (where there are only 2 outcomes possible, we can use this theory) Here we can use this formula : Ncr (p)^r * (q)^(n-r) =n =5, p = ½ q = (1-p) = ½ , r = 3 5c3 (1/2)^3*(1/2)^2 =5/48 answer
  42. 42. In how many ways can Gajendra invite some or all of his 5 friends in party hosted by him? (at least 1) Frmula of combination of 1 to all = 2^n – 1 = 2^5 - 1 = 32-1 =31 answer
  43. 43. How many words can be formed by using all the letters of the word DRAUGHT so that a. vowels always come together & b. vowels are never together? A There are 2 vowels. We treat them as 1. solution : 6!*2! = 1440 answer b. total possibilities = 7! = 5040 number of cases when vowels are not together = 5040-1440 = 3600 answer
  44. 44. In how many ways can a cricket eleven be chosen out of a batch of 15 players. 15c11 =15! / ((15-11)!*11!) =15!/(4!*11!) =(15*14*13*12)/(4*3*2*1) 1365 answer
  45. 45. In how many a committee of 5 members can be selected from 6 men 5 ladies consisting of 3 men and 2 ladies 6c3 *5c2 =[(6*5*4)/(3*2*1)] [(5*4)/(2*1)] =20*10 =200 answer
  46. 46. How many 4-letter word with or without meaning can be formed out of the letters of the word 'LOGARITHMS' if repetition of letters is not allowed 10p4 =(10*9*8*7) =5040 answer
  47. 47. how many ways can the letter of word 'LEADER' be arranged We have two e, so divide 6p6 by 2 6!/2! =720 / 2 =360 answer
  48. 48. How many arrangements can be made out of the letters of the word 'MATHEMATICS' be arranged so that the vowels always come together Let us treat all 4 vowels as 1 total digits are 11 we we take 11 – 4+1 = 8 digits vowels can be arranged among themselves = 4!/2! =8!/ (2!*2!) * 4!/2! = 120960 answer
  49. 49. In how many different ways can the letter of the word 'DETAIL' be arranged in such a way that the vowels occupy only the odd positions We have 3 odd and 3 even positions =3! *3! =36 answer
  50. 50. How many 3 digit numbers can be formed from the digits 2,3,5,6,7 and 9 which are divisible by 5 and none of the digits is repeated? Last digit must be 5 now we have 5 options for 1 st and 4 options for 2 nd digit =5*4 = 20 answer
  51. 51. In how many ways can 21 books on English and 19 books on Hindi be placed in a row on a self so that two books on Hindi may not be together? We have 22 places for Hindi books. 22p19 *21!
  52. 52. Out of 7 constants and 4 vowels how many words of 3 consonants and 2 vowels can be formed? Selection of 5 digits =7c3 *4c2 =35*6 = 210 5 digits can be arranged in 5! ways =120 total options : 210*120 = 25200 answer
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