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17 June, 11:40

12 yellow balls and 7 red balls are placed in an urn. two balls are then drawn in succession without replacement. what is the probability that the first ball drawn is a red ball if the second ball drawn is yellow?

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  1. 17 June, 13:46
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    Total number of balls = 12 + 7 = 19

    p (first ball is a red) = 7/19

    Answer: 7/19
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