[" 12.In a test,an examinee either guesses or copies or knows the "],[" answer to a multiple choice question with four choices.The "],[" probability that he makes a guess is "(1)/(3)" .The probability that "],[" he copies is "(1)/(6)" and the probability that his answer is correct "],[" given that he copied it is "(1)/(8)" .The probability that he knew "],[" the answer to the question given that he correctly answered "],[" it,is "],[[" (a) "(24)/(29)," (b) "(1)/(4)],[" (c) "(3)/(4)," (d) "(1)/(2)]]