Question: 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

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?

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