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12 February, 19:23

What expression would give the number of ways to choose a group of 7 from a group of 15?

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  1. 12 February, 21:46
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    C (15, 7)

    (15 * 14 * 13 * 12 * 11 * 10 * 9) / (7 * 6 * 5 * 4 * 3 * 2 * 1) = 6435 groups
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