Ononot — Three boxes: X(2R, 1B), Y(1R, 2B), Z(3R, 3B). Pick a box, th

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Conditional Probabilitymedium

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Three boxes: $X(2R, 1B), Y(1R, 2B), Z(3R, 3B)$ . Pick a box, then pick a marble. Probability the marble is red?