Arithmetic Ability
 Probability

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Q.

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.

View Answer

Correct choice: D

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.
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