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 Unordered groupings are called combinations.
 The # of combinations of r objects, taken from
a group of n distinct objects is denoted nCr
nCr =
 Find the # of combinations:
 5C2
 6C5
 9C9
 Find the # of combinations 10C6
 To find the # of ways both event A and B can
occur:
 MUTLIPLY the two combinations.
 When finding # of ways event A or B can
occur:
 ADD the two combinations
 A standard deck of 52 playing cards has 4
suits with 13 different cards in each suit.
 If the order cards are dealt is not important,
how many different 5-card hands are
possible?
 In how many of these are all five cards the
same suit?
 How many possible 5-card hands contain
exactly 3 kings?
 How many different 7-card hands are
possible? (order is not important)
 How many hands have all 7 cards the same
suit?
 A restaurant serves omelets
that can be ordered with
any of the ingredients shown.
 How many omelets can you
order with exactly 2 veggies
and 1 meat?
Vegetarian Meat
Green pepper Ham
Red pepper Bacon
Onion Sausage
Mushroom Steak
Tomato
Cheese
 If you can afford at most 3
ingredients in your omelet,
how many different types
can you order?
Vegetarian Meat
Green pepper Ham
Red pepper Bacon
Onion Sausage
Mushroom Steak
Tomato
Cheese
 You are taking a vacation and can visit as
many as 5 different cities and 7 different
attractions.
 How many ways can you visit exactly 3 cities
and 4 attractions?
 How many ways can you visit at least 8
locations?
 How many ways can you choose at least 18
people from a group of 20 volunteers?
 Rather than adding several combinations, it
can be faster to subtract ones you don’t
want.
 Example:
 How many ways can you attend at least 3
plays from a series of 12?
 A restaurant offers 6 salad toppings. You are
allowed to choose up to 4 toppings. How
many different salads can you have?
 Every student council committee must
contain at least 1 senior. If there are 7
seniors on student council, how many
different combinations of seniors can be
assigned to a committee?

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12.2 combinations

  • 1.
  • 2.  Unordered groupings are called combinations.  The # of combinations of r objects, taken from a group of n distinct objects is denoted nCr nCr =
  • 3.  Find the # of combinations:  5C2  6C5  9C9
  • 4.  Find the # of combinations 10C6
  • 5.  To find the # of ways both event A and B can occur:  MUTLIPLY the two combinations.  When finding # of ways event A or B can occur:  ADD the two combinations
  • 6.  A standard deck of 52 playing cards has 4 suits with 13 different cards in each suit.  If the order cards are dealt is not important, how many different 5-card hands are possible?  In how many of these are all five cards the same suit?
  • 7.  How many possible 5-card hands contain exactly 3 kings?
  • 8.  How many different 7-card hands are possible? (order is not important)  How many hands have all 7 cards the same suit?
  • 9.  A restaurant serves omelets that can be ordered with any of the ingredients shown.  How many omelets can you order with exactly 2 veggies and 1 meat? Vegetarian Meat Green pepper Ham Red pepper Bacon Onion Sausage Mushroom Steak Tomato Cheese
  • 10.  If you can afford at most 3 ingredients in your omelet, how many different types can you order? Vegetarian Meat Green pepper Ham Red pepper Bacon Onion Sausage Mushroom Steak Tomato Cheese
  • 11.  You are taking a vacation and can visit as many as 5 different cities and 7 different attractions.  How many ways can you visit exactly 3 cities and 4 attractions?  How many ways can you visit at least 8 locations?
  • 12.  How many ways can you choose at least 18 people from a group of 20 volunteers?
  • 13.  Rather than adding several combinations, it can be faster to subtract ones you don’t want.  Example:  How many ways can you attend at least 3 plays from a series of 12?
  • 14.  A restaurant offers 6 salad toppings. You are allowed to choose up to 4 toppings. How many different salads can you have?
  • 15.  Every student council committee must contain at least 1 senior. If there are 7 seniors on student council, how many different combinations of seniors can be assigned to a committee?