If the probability that A will live 15 year is 7/8 and that B will live 15 year is 910, then what is the probability that both will live after 15 year ?
A. 1/20
B. 63/80
C. 1/5
D. None of these
Answer : B. 63/80
Explanation:
P(A) = 7/8, P(B) = 9/10
Required Probability = P(A) x P(B)
= (7/8) x (9/10)
= 63/80.
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