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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.

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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. 1/3

C. 2/5

D. 9/20

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Best answer

Correct option is C. 2/5

A = Failing in Physics

B = Failing in Mathematics

P(A) = 30%

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