SOLUTION: How many different 2-member tennis teams can be made from 7 students?

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Question 1072880: How many different 2-member tennis teams can be made from 7 students?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
How many different 2-member tennis teams can be made from 7 students?
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The 1st choice is 1 of 7, then 1 of 6 ---> 7*6 = 42 teams.
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But, choosing students A & B is the same as B & A.
42/2 = 21 different teams.