SOLUTION: if a box contains 12 transistors, 3 of which are defective. If 3 are selected at random what is the probability that all are defective

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Question 906395: if a box contains 12 transistors, 3 of which are defective. If 3 are selected at random what is the probability that all are defective
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
if a box contains 12 transistors, 3 of which are defective. If 3 are selected at random what is the probability that all are defective
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# of ways to select 3 defective:: 3C3 = 1
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# of random sets of 3:: 12C3 = (12*11*10)/(1*2*3) = 220
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P(3 defective) = 1/220
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Cheers,
Stan H.