Posted by **joe** on Saturday, April 17, 2010 at 5:00pm.

How do you do this question?

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 -
**bobpursley**, Saturday, April 17, 2010 at 5:57pm
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

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