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how many different ways can you pick 2 objects from a set of 7 objects?

  • math -

    The number of ways to pick m objects from n is
    C(n,m) = n!/(m!(n-m)!)

    So 2 objects from 7 there are C(n,m) [n choose m] ways.
    C(n,m)=7!/(5!(7-5)!)=28

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