Question: Peter and Paul are taking a physics course which has only three grades: A, B and C. The probability that Peter gets a B is

Peter and Paul are taking a physics course which has only three grades: A, B and C. The probability that Peter gets a B is 0.3. The probability that Paul gets a B is 0.4. The probability that neither gets an A but at least one gets a B is 0.1. What is the probability that at least one gets a B but neither gets a C?

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