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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