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7 May, 22:26

You have a set of 21 songs. How many different groups of 17 could you make?

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Answers (2)
  1. 7 May, 23:40
    0
    1.

    21 - 17 = 4

    only 1 group
  2. 8 May, 02:09
    0
    C (21,17) = 21*20*19*18/4*3*2 = 215460
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