A lot consist s of 144 ball pens of which 20 are defective and others are good.
A lot consist s of 144 ball pens of which 20 are defective and others are good. Nuri will buy a pen if it is good, but will not buy if it is defective. The shopkeeper draws one pen at random and gives it to her. What is the probability that:
(i) she will buy it ?
(ii) she will not buy it ?
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Total no. of pens = 144
Defective one : 20
Good ones = 744-20 = 124
Probability of purchasing pen
= 124/144 = 31/36
Probability of not purchasing pen
= 20/144 = 5/36
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