Question

In a bag there are 100 bulbs out of which 30 are defective ones. A bulb is taken out of the bag At random.Find the probability of the selected bulb to be a good one

Answer 1

Out of 100 bulbs,30 are defective.
Hence, Probability = (100-30)/100
=70/100
=7/10.

Answer 2

No. Of bulbs in the bag = 100

No. Of defective bulbs = 30

No. Of good bulbs = 100-30= 70

P( getting a good bulb ) = 1/70


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