The probability that Raj will be alive is years and Karan will be alive is years. What is the probability that both Raj and Karan will be dead ?
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As we see probability that Raj will be dead is 1-(7/15) =8/15 and probability that Karan will be dead is 1 -(7/10) =3/10.
So probability that both will be dead is (8/15) x (3/10) =24/150 =4/25.
PS:-Dont mind the meaning of the problem