Q. 475.0( 1 Vote )

Mark the correct alternative in each of the following:

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

Answer :

A = Failing in Physics


B = Failing in Mathematics


P(A) = 30%




P(B) = 25%



(Given)


P(AB) = 10%




Now we know,






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