1.

An urn contains 9 blue, 7 white and 4 black balls. If 2 balls are drawn at random, then what is the probability that only one ball is white ?

Answer»

91/190



Total possible outcomes 
= 20C2 = 20 X 19/1 x 2 = 190
Total FAVOURABLE outcomes = 7C1 x 13C1 = 7 x 13 = 91
∴ Required probability = 91/190



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