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[" 69.The probability that at least one ...

[" 69.The probability that at least one of the events "A" and "B" occurs is "0.7" and they occur "],[" simultaneously with probability "0.2" .Then "P(A)+P(B)=?],[[" (a) "0.8," (b) "0.6," (c) "1.1," (d) "1.4]]

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