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A signal which can be green or red with ...

A signal which can be green or red with probability `4/5 and 1/5` respectively, is received by station A and then and 3 transmitted to station B. The probability of each station receiving the signal correctly is `3/4` If the signal received at station B is green, then the probability that the original signal was green is

A

a) 3/5

B

b) 6/7

C

c) 20/23

D

d) 9/20

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