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
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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`
Concept: Probability - A Theoretical Approach
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