SOLUTION: A book shelf containing 20 books of which 12 are on circuit theory and 8 are on Mathematics. If three books are taken out at random, find the probability that all the three are on
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Question 250484: A book shelf containing 20 books of which 12 are on circuit theory and 8 are on Mathematics. If three books are taken out at random, find the probability that all the three are on the same subject Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! A book shelf containing 20 books of which 12 are on circuit theory and 8 are on Mathematics. If three books are taken out at random, find the probability that all the three are on the same subject
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Pick 3 of either type: 12C3 + 8C3
Pick 3 randomly: 20C3
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Prob(3 on same sub) = 276/1140 = 0.2421
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Cheers,
Stan H.
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