Show that the probability that an event A or an event B or both will occur is given by the formula P(AUB) = P(A)+P(B)–P(AnB), and specialise this formula for the case (a) when A, B are mutually exclusive events and for the case (b) where A, B are statistically independent events. %3D Find the probabilities P(A), P(B) when A, B are statistically independent events such that P(B) = 2P(A) and P(AU B) = 5/8. %3D

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