[" EXAMPLE "104" 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 "(3)/(4)" .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)],[" 9] ",,," [IIT 2010] "]]