Question

4) The odds against a husband who is 60 years
old, living till he is 85 are 7:5. The odds
against his wife who is now 56, living till
she is 81 are 5:3. Find the probability that
a) at least one of them will be alive 25
years
hence
b) exactly one of them will be alive 25 years
hence.​

Answer 1

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