What expression would give the number of ways to choose a group of 7 from a group of 15?
1 answer:
C(15, 7)
(15 * 14 * 13 * 12 * 11 * 10 * 9)/(7 * 6 * 5 * 4 * 3 * 2 * 1) = 6435 groups
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