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# 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 She Will Not Buy It? - CBSE Class 10 - Mathematics

ConceptProbability - A Theoretical Approach

#### 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 She will not buy it?

#### Solution

Total number of pens = 144

Total number of defective pens = 20

Total number of good pens = 144 − 20 = 124

P (she will not buy a pen)  = 1 - 31/36 = 5/36

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#### APPEARS IN

NCERT Solution for Mathematics Textbook for Class 10 (2019 to Current)
Chapter 15: Probability
Ex. 15.10 | Q: 21.2 | Page no. 310

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Solution 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 She Will Not Buy It? Concept: Probability - A Theoretical Approach.
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