RD Sharma Solutions Class 11 Derivatives Exercise 30.2

RD Sharma Solutions Class 11 Chapter 30 Exercise 30.2

RD Sharma Class 11 Solutions Chapter 30 Ex 30.2 PDF Free Download

Exercise 30.2

Practise This Question

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 13 and the probability that he copies the answer is 16. The probability that his answer is correct given that he copied it is 18. Find the probability that he knew the answer to the question, given that he answered it correctly.