SOLUTION: A quality control inspector samples 5 computer chips from a box containing 11 computer chips. If the box contains 2 defective chips, in how many ways can he select a sample so tha

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Question 505240: A quality control inspector samples 5 computer chips from a box containing 11 computer chips. If the box contains 2 defective chips, in how many ways can he select a sample so that both defective chips are selected?
I've tried FCP 3*2*1*2*1
I've tried: 11nCr5-11nCr2
Ive tried: 11nCr5 - 2nCr1 - 2nCr0 * 9nCr5
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
A quality control inspector samples 5 computer chips from a box containing 11 computer chips. If the box contains 2 defective chips, in how many ways can he select a sample so that both defective chips are selected?
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# of ways to select 2 defective = 2C2 = 1
# of ways to select 3 other = 9C3 = 84
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Ans: # of ways to pick 5 chips with 2 defective: 1*84 = 84
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Cheers,
Stan H.