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Multiple Choice Questions

If a box contains 10 bulbs of which just three are defective If a random sample of five bulbs is dra...........

Quantitative Aptitude ( CCS) Probability
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    If a box contains 10 bulbs,of which just three are defective. If a random sample of five bulbs is drawn, find the probability that the sample contains no defective bulbs.

    1/12

    Correct Answer

    5/12

    Incorrect Answer

    7/12

    Incorrect Answer

    11/12

    Incorrect Answer
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    Explanation:

    Total number of elementary events = 10C5

    Number of ways of selecting no defective bulbs i.e., 5 non-defective bulbs out of 7 is 7C5

    So,required probability =7C5 /10C5 = 1/12.

    Hence, option 1 is the correct answer.

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