1.

A lot consists of 144 ball pens of which 20 are defective and the others are good. Nuriwill buy a pen if it is good, but will not buy if it is defective. The shopkeeper draws onepen at random and gives it to her. What is the probability that(i) She will buy it ?(ii) She will not buy it?

Answer»

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Number of pen she not by is



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