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

A signal which can 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 reciving the signal correctly is `3/4.` If the singal received at station B is green, then the probability that original singal was green is

A

`3/5`

B

`6/7`

C

`20/23`

D

`9/20`

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