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Anurn contains 6 red,4 blue ,2 green and 3yellow marbles If four marbles are picked at random , what is the probability that at least one is blue ? A. 4 15 B. 69 91 C. 11 15 D. 22 91 Select the correct answer from above options

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Correct Answer - B Number of way of selecting 4 marbles out of 15 marbles =15C4= 15×14×13×12 4×3×2×1 =1365 Number of ways of selecting 4 marbles when no one is blue =11C4= 11×10×9×8 4×3×2×1 =330 Probability of getting 4 marbles (when no one is blue ) = 330 1365 = 22 91 Probability that at least one is blue =1- 22 91 = 69 91

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