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It is 9 to 5 against a person who is 50 ...

It is 9 to 5 against a person who is 50 years living till he is 70 and 8 to 6 against a person who is 60 years living till he is 80. Find the probability that at least one of them will be alive after 20 years.

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The correct Answer is:
`(31)/(49)`
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