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In a college, 30% students fail in physics, 25% fail in mathematics and 10% fail in both.

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In a college, 30% students fail in physics, 25% fail in mathematics and 10% fail in both. One student is chosen at random. The probability that she fails in physics if she has failed in mathematics is

(A) 1/10

(B) 2/5

(C) 9/20

(D) 1/3

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Answer is (B)

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