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# A Box Contains 150 Bulbs Out of Which 15 Are Defective. It is Not Possible to Just Look at a Bulb and Tell Whether Or Not It is Defective. One Bulb is Taken Out at Random from this Box. Calculate the Probability that the Bulb Taken Out Is: a Good One - Mathematics

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#### Question

A box contains 150 bulbs out of which 15 are defective. It is not possible to just look at a bulb and tell whether or not it is defective. One bulb is taken out at random from this box. Calculate the probability that the bulb taken out is:

a good one

#### Solution

Total number of possible outcome =150

Out of 150 bulbs, 15 are defective

Number of bulbs which are good 150-15=135

P(taking out a  good bulb)=135/150=9/10

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