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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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The correct Answer is:
C
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