Multiple Choice Questions on Two brother X and Y appeared for an exam The probability of selection of X is 1 7 and that of B is 2........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

Two brother X and Y appeared for an exam The probability of selection of X is 1 7 and that of B is 2...........

Quantitative Aptitude ( CCS) Probability
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    Two brother X and Y appeared for an exam. The probability of selection of X is 1/7 and that of B is 2/9. Find the probability that both of them are selected.

    1/63

    Incorrect Answer

    1/14

    Incorrect Answer

    2/63

    Correct Answer

    1/9

    Incorrect Answer
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    Explanation:

    Let A be the event that X is selected and B is the event that Y is selected.

    P(A) = 1/7,  P(B) = 2/9.

    Let C be the event that both are selected.

    P(C) = P(A) × P(B) as A and B are independent events:

    = (1/7) × (2/9)  = 2/63

    Hence, option 3 is the correct answer.

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