In an examination there are four Yes/No type of questions. The probability that the answer by the student to a question without guess to be correct is 2/3. The probability that a student guesses a correct answer is 1/2. A student writes the examination either by without guessing answers to all the 4 questions or by guessing answers to all 4questions. The probability that he attempt the exam by guessing answers to all questions is 3/7. Given that a student answered at least 3 questions correctly, the probability that he answered all the questions without guessing is

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Correct Answer is : 102414291024/142914291024​

TS EAMCET 10-Sep-2020 Shift 2 Solved Paper