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eviant:
During an extended vacation, you plan to read 3 books out of the 10 on your shelf that you’ve been meaning to read. How many different groups of 3 books might you take with you to read on vacation?
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eviant:
@Vocaloid
Vocaloid:
nCr where n is the total number of books and r is the number of books being chosen in the group = n! / r! (n - r)!
eviant:
3048192000
Vocaloid:
to make it more clear n! / [r! (n - r)!]
Vocaloid:
10! / [3!(10-3)!]
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