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Question

The probability that a man will live 10 more years is 14 and the probability that his wife will live 10 more years is 13. Then, the probability that none of them will be alive after 10yrs is.

A
512
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B
12
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C
712
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D
1112
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Solution

The correct option is B 12
The probability that a man will not alive after 10yrs =114=34
The probability that his wife will not alive after 10yrs =113=23
Now, the probability that none of them will be alive after 10yrs =34×23=12

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