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A box contains 26 white , 38 blue and 36 yellow balls. a)if 3 balls are drawn randomly with replacement ,what is the probability that only one ball is blue that only one ball is yellow?

最佳解答:

total no. of balls in the box = 26 + 38 + 36 = 100 a) only one ball is blue : 38/100 x 62/100 x 62/100 x 3 x 100% = 42.82% b) only one ball is yellow 36/100 x 64/100 x 64/100 x 3 x 100% = 44.24%

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