SOLUTION: A box contains 10 chips. Seven of the chips are perfect, but the remaining three have some imperfection. In a random drawing of 4 chips without replacement, what is the probabilit

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Question 626655: A box contains 10 chips. Seven of the chips are perfect, but the remaining three have some imperfection.
In a random drawing of 4 chips without replacement, what is the probability that all the chips are perfect?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
A box contains 10 chips. Seven of the chips are perfect, but the remaining three have some imperfection.
In a random drawing of 4 chips without replacement, what is the probability that all the chips are perfect?
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# of ways to succeed: 7C4 = 7C3 = (7*6*5)/(1*2*3) = 35
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# of random outcomes: 10C4 = (10*9*8*7)/(1*2*3*4) = 210
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P(4 perfect) = 35/210 = 1/6
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Cheers,
Stan H.