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Mathematics 21 Online
OpenStudy (safari321):

Six students are pairing up to play tennis.In how many different ways can they pair up?

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

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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