Multiple Choice Questions on A box contains 20 bulbs out of which 5 are defective Three bulbs are randomly taken out of the box W........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

A box contains 20 bulbs out of which 5 are defective Three bulbs are randomly taken out of the box W...........

Quantitative Aptitude ( CCS) Probability
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    A box contains 20 bulbs out of which 5 are defective. Three bulbs are randomly taken out of the box. What is the probability that out of the three at least one bulb is defective?

    128/221
    Incorrect Answer
    137/228
    Correct Answer
    131/220
    Incorrect Answer

    129/228

    Incorrect Answer
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    Explanation:

    Probability that atleast one bulb is defective = 1 – P (All are non-defective)
    = 1 – 15C3/20C3 = 137/228

    Hence, option 2 is the correct answer.

    By: Amit Kumar
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