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A smoke detector system uses two devices, A and B. If smoke is present, the probability that it will be detected by device A is

A smoke detector system uses two devices, A and B. If smoke is present, the probability that it will be detected by device A is 0.88, by device B, 0.88, and by both devices, 0.84. If smoke is present, what is the probability that it will be detected by device B given that it is detected by device A ?

Answer is 95.45 According to quiz, but how???

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