Class 10 Chapter 15 Probability || Ex 15.1 (Q21) || NCERT (2019)

Class 10 Maths Chapter 15 Probability LECTURE26 NCERT
EXERCISE 15.1 Q21 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 ?
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