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

Mathematics
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This is not permutations luis, it's combinations
720 ways?
he is wrong

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Other answers:

oh
he was saying that if Anne and Bill paired up, it would be different than Bill and Anne pairing up
oh
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|
pick one person, person A then their are 5 choices for partners. after that pick another, there are 3 choices of partners. then no choices
so there's a formula for combinations?
! means factorial, and you multiply by all the natural numbers less than the number in front of the !, so for 6! it would be, 6 x 5 x 4 x 3 x 2 x 1
then that'll be the outcome of the of combinations?
6! = 720, then we divide by 2! (which is just 2) times (6-2)! 2 x 4! = 4 x 3 x 2 x 2 x 1 = 48, so the answer is 720 divided by 48 which simplifies to 15
okay mridrick thanks!
you're welcome
:)
:D

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