Evaluate P(A cup B), if 2P(A)=P(B)=(5)/...

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

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The correct Answer is:

`P(E//F)=(2)/(3), P(F//E)=(1)/(3)`

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