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Question 1
The probability that a man who is 85 yrs old will die before attaining the age of 90 is $1/3$. $A_1, A_2, A_3, A_4$ are four persons aged 85 yrs. The probability that $A_1$ will die before attaining 90 and will be the first to die is:
A.
$\dfrac{3}{5}$
B.
$\dfrac{13}{81}$
C.
$\dfrac{65}{324}$
D.
$\dfrac{13}{108}$
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