SOLUTION: Betty has 20 different books. If 4 books are selected from these 20 books, how many combinations are there?

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Question 1173852: Betty has 20 different books.
If 4 books are selected from these 20 books, how many combinations are there?
Answer by ikleyn(52778) About Me  (Show Source):
You can put this solution on YOUR website!
.

    C%5B20%5D%5E4 = %2820%2A19%2A18%2A17%29%2F%281%2A2%2A3%2A4%29 = 4845.    ANSWER

Solved.