SOLUTION: Consider all the subsets of {r, s, t, u, v, x}. How many of them have 3 elements?

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Question 476971: Consider all the subsets of {r, s, t, u, v, x}. How many of them have 3 elements?
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
There are 2%5E6+=+64 different subsets. Of these, 6C3 = 20 of them have 3 elements.