Wednesday, 9 November 2011

Probability-2 (IIT-JEE 2009)

A signal which can be green or red with probability 4/5 and 1/5 respectively, is received by station A, and then transmitted to station B. The probability of each station receiving the signal correctly is ¾. If the signal received at station B is green, then the probability that the original signal was green is
(a)3/5          (b) 6/7             (c)20/23                         (d)9/20
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