CAT 2017 Probability Question (Medium)

Question

John was writing an entrance test. Every question is a multiple choice question with four probable answers and one correct answer. The probability that he knows the answer is 80 . If he correctly answered a question, then what is the probability that he was guessing?

Optima Learn · Accepted Answer

Understanding Every question on John s entrance test has four choices, one correct. The probability he knows the answer to a given question is 80 otherwise, he guesses randomly among the four options. Given that he answered a question correctly, we need the probability that he was actually guessing.

CAT 2017 Probability — Previous Year Question

CAT 2017

Quantitative

Probability

Medium

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