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Given P(A) =0.5 and P(B) =0.4 do the following. (a) If A and B are mutually exclusive, compute P(A or B) Answer: .9 Help me

Given P(A) =0.5 and P(B) =0.4 do the following.

(a) If A and B are mutually exclusive, compute P(A or B)

Answer: .9

Help me find:

(b) If P(A and B) =0.3, compute P(A or B)

Answer: ??

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