John and Mary are taking a mathematics course. The course has only three
grades: A, B, and C. The probability that John gets a B is .3. The probability
that Mary gets a B is .4. The probability that neither gets an A but at least
one gets a B is .1. What is the probability that at least one gets a B but
neither gets a C?
Phew. Could not crack this question even after trying it for 10 minutes. Bunuel/Shrouded/Other GMATClub members -- Could you please help here?
Side note: How to bump up a thread??? Should someone just reply or is there a way to do it without replying to the post?
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