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Question

A bag contains 7 green, 4 white and 5 red balls. If four balls are drawn one by one with replacement. What is the probability that one is red?

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Solution

Red ball may be drawn at any of the four draws
(516×1116×1116×1116)×4C1
where 516 is the probability of drawing a red ball and 1116 is the probability of not drawing a red ball for each draw
5×113163×16×4
=665516384=0.41

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