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If the probability that A will live 15 yr is 7/8 and that B will live 15 yr is 9/10, then what is the probability that both will live after 15 yr?

1/20
63/80
1/5
None of these

Correct Answer: 63/80

Explanation:

Required probability = P(A) x P(B)
= (7/8) x (9/10)
= 63/80

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