mfuhrmann8757 mfuhrmann8757
  • 23-08-2018
  • Mathematics
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You have seven old books and need to choose four to give away.

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JiakSai
JiakSai JiakSai
  • 23-08-2018

7C4 = (7x6x5x4) / (4x3x2x1) = 35 different combinations

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