Question

out of 200 bulbs in a box, 12 bulbs are defective. one bulb is taken out at random from te box. wat is the probability that the drawn bulb is not defective

Answer 1

No.of bulbs which are defective = 12
Total no.of bulbs = 200
Probability of not getting defective bulb = (200-12)/200 = 188/200 = 94/100 = 0.94 

Answer 2

Total number of bulbs=200
Number of defective bulbs=18
Good quality bulbs=188
Probability (not getting a defective bulb) =188/200
=94/100
=0.94