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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(a)3/5 (b) 6/7 (c)20/23 (d)9/20

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