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math 12

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Ryan reaches into his gym bag for a pair of running shoes. If there are seven different pairs of shoes loose in the bag, how many ways can he pick two shoes that do not match?

  • combinations -

    Number of ways he can choose two shoes
    =14C2
    =14!/(2!12!)
    =14*13/2
    =91
    Number of ways he can choose matching shoes
    = 7
    So how many ways can he choose non-matching shoes?

  • math 12 -

    adawdawd

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