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.

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Asked: September 6, 20212021-09-06T16:54:52+05:30 2021-09-06T16:54:52+05:30Category: Quantitative Aptitude - Arithmetic Ability

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Mighty Ashish · Answer 1 · 2021-09-06T16:55:51+05:30

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.