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The odds against a man who is 45 years o...

The odds against a man who is 45 years old, living till he is 70 are `7:5` and the odds against his wife who is now 36, living till she is 61 are `5:3`. Find the probability that (a) the couple will be alive 25 years hence, (b) at least one of then will be alive 25 years hence.

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The correct Answer is:
`(61)/(96)`
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