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    There are two scenarios * The probability of picking a white ball from X (5/9) and then picking a black ball from Y (6/14) is (5/9) * (6/14) * The probability of picking a black ball from X (4/9) and then picking a black ball from Y (7/14) is (4/9) * (7/14)

    The final probablity is the sum of the two conditions above.