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A shipment of 25 television sets contains three defective units. In how many ways can a vending company purchase four of these units and receive (a) all good units, (b) two good units, and (c) at least two good units.

  • math -

    ways to get 4 good units: 1 (good, good, good, good)

    ways to get two good:
    GGBB
    GBBG
    GBGB
    BBGG
    BGBG
    BGGB

    ways to get at least two good:
    above ways, plus
    GGGG
    PLus
    GGGB
    GBGG
    GGBG
    BGGG

  • math -

    BGGG

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