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0 votes
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in Mathematics by (61.9k points)

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 ?

1 Answer

+1 vote
by (63.1k points)
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Best answer

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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