SOLUTION: How many 3-element subsets does the set (A, B, C, D, E, F) have?

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Question 1053374: How many 3-element subsets does the set (A, B, C, D, E, F) have?
Answer by ikleyn(52786) About Me  (Show Source):
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How many 3-element subsets does the set (A, B, C, D, E, F) have?
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C%5B6%5D%5E3 = %286%2A5%2A4%29%2F%281%2A2%2A3%29 = 5*4 = 20.

C%5B6%5D%5E3 is the number of combinations of 6 objects taken 3 at a time.

On combinations, see the lessons
    - Introduction to Combinations
    - PROOF of the formula on the number of Combinations
    - Problems on Combinations
in this site.

Also, you have this free of charge online textbook in ALGEBRA-II in this site
    - ALGEBRA-II - YOUR ONLINE TEXTBOOK.

The referred lessons are the part of this online textbook.