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  1. 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. 1/20
    2. 63/80
    3. 1/5
    4. None of these
Correct Option: B

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


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