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Higher Engg. Mathematics by B.S. Grewal probability & statistics

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Out of 50 rare books, 3 of which are especially valuable, 5 are stolen at random by a thief.?

What is the probability that a) none of the 3 is included b) 2 of the 3 are included?
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given total books=50

a)prob = 47c5/50c5
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b)prob = [47c3*3c2]/50c3
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