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Anwesha Patel
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Asked: 2023-02-28T07:14:37+00:00 In:

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

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(i) She will buy it ?
(ii) She will not buy it ?
NCERT Class 10 Math’s Chapter 15 Probability
Page No. 310
Exercise 15.1
Question No. 21

chapter 15mathematicsncert class 10
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    1. Best Answer

      Total number of pens = 144
      Total number of defective pens = 20
      Total number of good pens = 144 – 20 = 124
      (i) Probability of getting a good pen = 124/144 = 31/36
      P (Nuri buys a pen) = 31/36
      (ii) P (Nuri will not buy a pen) = 1 – 31/36 = (36 – 31)/36 = 5/36

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