probability, Mathematics

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an insurance salesman sells policies to 5 men, all of identical age in good health. the probability that a man of this particular age will be alive 20 years hence is 2/3.Find the probability that in 20years(i) all mmen will be alive (ii) at least 3 men will be alive (iii) only two men will be alive (iv) at least 1 man will be alive

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