Multiple Choice Questions on A box contains 10 screws 3 of which are defective Two screws are drawn at random with replacement Th........... for NDA Exam Preparation

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Multiple Choice Questions

A box contains 10 screws 3 of which are defective Two screws are drawn at random with replacement Th...........

Mathematics (NDA) Probability
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    A box contains 10 screws,3 of which are defective. Two screws are drawn at random with replacement. The probability that none of the two screws is defective will be?

    100%

    Incorrect Answer

    55%

    Incorrect Answer

    49%

    Correct Answer

    None of these

    Incorrect Answer
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    Explanation:

    N=2

    X=0  no defective

    P (defective)=3/10

    So   p(x=0)= 2 C0 (3/10)0  (1-  3/10 )2

    =0.49

    =49%

    By: bhavesh kumar singh
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