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Question 40(i)
A lot consists of 48 mobile phones of which 42 are good, 3 have only minor defects, 3 have major defects. Varnika will buy a phone if it is good but the trader will only buy a mobile if it has no major defect. One phone is selected at random from the lot. What is the probability that it is acceptable to Varnika?

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Solution


Let E1 = Event that Varnika will buy a mobile phone
= Varnika buy only, if it is good mobile
n(E1)=42P(E1)=n(E1)n(S)=4248=78

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