Multiple Choice Questions on A bag contains 12 Green and 8 White balls Four balls are drawn out one by one and not replaced What ........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

A bag contains 12 Green and 8 White balls Four balls are drawn out one by one and not replaced What ...........

Quantitative Aptitude ( CCS) Probability
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    A bag contains 12 Green and 8 White balls. Four balls are drawn out one by one and not replaced. What is the probability that they are in alternate colours?

    310/2425
    Incorrect Answer
    308/4845
    Correct Answer
    284/2425
    Incorrect Answer

    273/4845

    Incorrect Answer
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    Explanation:

    P=12C1/20C1* 8C1/19C1*11C1/18C1*7C1/17C1
    =12/20*8/19*11/18*7/17
    =308/4845.

    Hence, option 2 is the correct answer.

    By: Amit Kumar
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