1.

A basket contains 5 blue, 4 green and 3 red ball. If three balls are picked at random, what is the probability that at least one is red ?

Answer»

34/55



Probability of having no RED BALL is
9C3 / 12C3 = 21/55
Probability of having at LEAST ONE red ball is 1 - 21/55 = 34/55



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