The probability that a student passes Biology is 0.35 and the probability to pass Chemistry is 0.63. If the probability to pass both Biology and Chemistry is 0.4, what is the probability that he will pass either Biology or Chemistry?

Answer 1

Prob(B or C) = Prob(B) + Prob(C) - Prob(B and C)
= .35+.63 - .4
= ...

Answer 2

0.58