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8 March, 19:13

How many subsets of at least four elements does a set of seven elements have?

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Answers (1)
  1. 8 March, 19:40
    0
    1234567

    1234

    2345

    3456

    4567

    5671

    6712

    7123

    12345

    23456

    34567

    45671

    56712

    67123

    71234

    123456

    234567

    345671

    456712

    567123

    671234

    712345

    1234567

    22 subsets.
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