math

two urn contain respectively 3 white, 7 red, 15 black and 10 white ,6 red and 9 black balls. one ball is drawn from each urn. what is the probability bthat both balls are of the same colour.

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  1. 25 in urn 1
    25 in urn 2

    2 white - 3/25 * 10/25
    2 red - 7/25 * 6/25
    2 black - 15/25 * 9/25

    add the results

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