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Class 10
Mathematics
Probability
a lot consists of 144 ball pens of which 20 are de...

Question:
A lot consists of 144 ball pens of which 20 are defective and the 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 ?

Answer:

Total no. Of ball pens = 144

Number of defective ball pens = 20

Total no. Of good ball pens = 144 – 20 = 124

(i) Probability that she will get a good pen = 124/144 = 31/36

(ii) Probability that she will get a defective pen

= 20/144 = 5/36

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