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Examples on Permutations and Combinations

                                             Mathematics 4


                                            February 23, 2012




Mathematics 4
Examples on Permutations and Combinations
Example



      A stalker classmate observed that her crush’s smartphone has
      fingerprint smudges corresponding to the numbers 2,4,7, and 9 on
      the passcode entry screen. She correctly figures out that her
      crush’s passcode must be using those four digits. What is the
      largest possible number of trials that she needs to take to access
      the contents of the smartphone?




Mathematics 4
Examples on Permutations and Combinations
Example




      How many 7 digit numerical palindromes are there? (Example:
      34543)




Mathematics 4
Examples on Permutations and Combinations
Example

      Given the grid below, how many paths from A to B are possible if
      moves are restricted to the right or up?




Mathematics 4
Examples on Permutations and Combinations
Example




      How many ways can a player select six numbers in the Lotto 6/42
      game?




Mathematics 4
Examples on Permutations and Combinations
Example
      How many different triangles can be formed by connecting any 3
      points in the vertices of a regular octagon?




Mathematics 4
Examples on Permutations and Combinations
Example
      How many different triangles can be formed by connecting any 3
      points in the vertices of a regular octagon?




Mathematics 4
Examples on Permutations and Combinations
Example




      How many ways can a student answer 10 questions correctly in a
      15 item quiz?




Mathematics 4
Examples on Permutations and Combinations
Example




      If each test item in the quiz above is a multiple choice question
      with 4 choices each, how many ways can a student answer the
      exam?




Mathematics 4
Examples on Permutations and Combinations
Example




      If each test item in the quiz above is a multiple choice question
      with 4 choices each, how many ways can a student make 5
      mistakes in the exam?




Mathematics 4
Examples on Permutations and Combinations
Example




      A customer in a fast food restaurant can choose any combination
      out of 7 condiments on a hamburger. How many burger sandwich
      combinations can the customer make?




Mathematics 4
Examples on Permutations and Combinations
Example




      The winner of the seven-game NBA championship series is the
      team that wins four games. In how many different ways can the
      series finish in seven games?




Mathematics 4
Examples on Permutations and Combinations
Example

      A full house is a hand that consists of three cards of one
      denomination and two cards of another denomination. How many
      5-card hands are full houses?




Mathematics 4
Examples on Permutations and Combinations
Example




      How many ways can we buy 12 donuts out of an unlimited supply
      of 5 flavors?




Mathematics 4
Examples on Permutations and Combinations

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Permutations and combinations examples

  • 1. Examples on Permutations and Combinations Mathematics 4 February 23, 2012 Mathematics 4 Examples on Permutations and Combinations
  • 2. Example A stalker classmate observed that her crush’s smartphone has fingerprint smudges corresponding to the numbers 2,4,7, and 9 on the passcode entry screen. She correctly figures out that her crush’s passcode must be using those four digits. What is the largest possible number of trials that she needs to take to access the contents of the smartphone? Mathematics 4 Examples on Permutations and Combinations
  • 3. Example How many 7 digit numerical palindromes are there? (Example: 34543) Mathematics 4 Examples on Permutations and Combinations
  • 4. Example Given the grid below, how many paths from A to B are possible if moves are restricted to the right or up? Mathematics 4 Examples on Permutations and Combinations
  • 5. Example How many ways can a player select six numbers in the Lotto 6/42 game? Mathematics 4 Examples on Permutations and Combinations
  • 6. Example How many different triangles can be formed by connecting any 3 points in the vertices of a regular octagon? Mathematics 4 Examples on Permutations and Combinations
  • 7. Example How many different triangles can be formed by connecting any 3 points in the vertices of a regular octagon? Mathematics 4 Examples on Permutations and Combinations
  • 8. Example How many ways can a student answer 10 questions correctly in a 15 item quiz? Mathematics 4 Examples on Permutations and Combinations
  • 9. Example If each test item in the quiz above is a multiple choice question with 4 choices each, how many ways can a student answer the exam? Mathematics 4 Examples on Permutations and Combinations
  • 10. Example If each test item in the quiz above is a multiple choice question with 4 choices each, how many ways can a student make 5 mistakes in the exam? Mathematics 4 Examples on Permutations and Combinations
  • 11. Example A customer in a fast food restaurant can choose any combination out of 7 condiments on a hamburger. How many burger sandwich combinations can the customer make? Mathematics 4 Examples on Permutations and Combinations
  • 12. Example The winner of the seven-game NBA championship series is the team that wins four games. In how many different ways can the series finish in seven games? Mathematics 4 Examples on Permutations and Combinations
  • 13. Example A full house is a hand that consists of three cards of one denomination and two cards of another denomination. How many 5-card hands are full houses? Mathematics 4 Examples on Permutations and Combinations
  • 14. Example How many ways can we buy 12 donuts out of an unlimited supply of 5 flavors? Mathematics 4 Examples on Permutations and Combinations