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A bag contains 10 balls, out of which 2 are white, 5 are red and 3 are black balls. If three are drawn at random, then the probability that two balls are of same colour is
Dear student ways of drawing three balls out of which 2 balls are same = = 2c2 *8c1 + 5c2 * 5c1 + 3c2 * 7c1 = 8 + 50 + 21 = 79 hence probability = 79/10c3 = 79 / 120
Dear student Please follow this link for generalisd solution of such prblems https://www.askiitians.com/forums/Algebra/an-urn-contains-m-white-and-n-black-balls-a-bal_104519.htmGood Luck Cheers
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