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A box contains 144 pens of which 20 are ...

A box contains 144 pens of which 20 are defective and the others are good. A person will buy a pen if it is good and will not buy if it is defective. The shopkeeper draws one pen from the box at random and gives it to the person. What is the probability that the person
(a) will buy it? (b) will not buy it?

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