Ononot — An urn contains n white balls and m black balls. Two balls a

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Conditional Probabilityhard

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An urn contains $n$ white balls and $m$ black balls. Two balls are drawn sequentially without replacement. Let $W_2$ be the event the second ball is white, and $A$ be the event that at least one of the two drawn balls is white. What is $P(W_2 | A)$ ?