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March 27, 2017

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selecting three (3) coins, but assume that there are 5 dimes, 4 nickels, and 2 quarters.

In how many possible ways can the selection be made so that the value of the coins is at least 25 cents?

  • math - ,

    The only possible cases are, hope I did not miss any
    DDD - 30
    DDN - 25
    DDQ - 45
    DNN - 20
    DNQ - 40
    DQQ - 60
    NNN - 15
    NNQ - 35
    NQQ - 55

    How many of these amount to at least 25 cents?

    (notice that the fact that we have 5 dimes and 4 nickels is of no consequence, since we can use at most 3, but the 2 quarters limits the cases)

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