a lot consists of 144 ball pens of which country are defective And The Other goods nobody will why when it is good but but will not why it is it defective the shopkeeper drawn one pen at random and give in WhatsApp only that she will buy it and she will not buy it
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Probabilty(she will buy)=144-20/144=124/144=62/72=31/36
Probability(She will not buy)=20/144=10/72=5/36
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