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Evaluate P(Acup B) , if 2 P (A) = P(B)...

Evaluate `P(Acup B) , ` if 2 P (A) ` = P(B) = (5)/(13) and P (A//B) = (2)/(5)*`

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The correct Answer is:
Again , `P(Acup B) = P(A) + P(B) - P(Acap B) = (5)/(26) + (5)/(13) = (5 + 10 - 4)/(26) = (11)/(26)`
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