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OpenStudy (safari321):
Six students are pairing up to play tennis.In how many different ways can they pair up?
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OpenStudy (anonymous):
This is not permutations luis, it's combinations
OpenStudy (safari321):
720 ways?
OpenStudy (anonymous):
he is wrong
OpenStudy (safari321):
oh
OpenStudy (anonymous):
he was saying that if Anne and Bill paired up, it would be different than Bill and Anne pairing up
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OpenStudy (safari321):
oh
OpenStudy (anonymous):
it can be written as nCr which means n choose r, where n is larger. so in this case it is 6 choose 2, and to find the answer, you plug them into this formula: |dw:1331001470884:dw|
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