Lesson 8-4 Combinations. Definition Combination- An arrangement or listing where order is not important. C(4,2) represents the number of combinations.

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Presentation transcript:

Lesson 8-4 Combinations

Definition Combination- An arrangement or listing where order is not important. C(4,2) represents the number of combinations of 4 things taken 2 at a time. The number of combinations of 4 things taken 2 at a time. The number of permutations of 4 things taken 2 at a time. The number of ways 2 things can be arranged.

Five teams are playing each other in a tournament. If each team plays every other team once, how many games are played? 10 Games

Find C(8, 5)

An eighth grade teacher needs to select 4 students from a class of 22 to help with sixth grade orientation. Does this represent a combination or a permutation? How many possible groups could be selected to help out the new students?

One of the 22 eighth grade students will be assigned to sixth grade classes on the first floor, another student will be assigned to classes on the second floor, another student will be assigned to classes on the third floor, and still another student will be assigned to classes on the fourth floor. Does this represent a combination or a permutation? In how many possible ways can the eighth graders be assigned to help with the sixth grade orientation?