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A lot consists of 144 ball pens of wh...

A lot consists of 144 ball pens of which 20 are defective and others 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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RD SHARMA ENGLISH-PROBABILITY -All Questions
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  16. Examine, If a die is thrown once, there are two possible outcomes ...

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