Arithmetic Ability
 Probability

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Q.

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 exactly one defective bulb.

View Answer

Correct choice: A

Explanation:

Total number of elementary events = 10C5 Number of ways of selecting exactly one defective bulb out of 3 and 4 non-defective out of 7 is 3C1*7C4 So,required probability =3C1*7C4 /10C5 = 5/12.
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