NDA 2026 Mathematics question
In an entrance test there are multiple choice questions. There are four options for each question, of which only one is correct. The probability that a student knows the answer to a question is 90%. If he gets the correct answer to a question, then what is the probability that he was guessing?
Answer: (C)
Solution
Let = knows the answer, = guesses, = answers correctly. , , , \mid$ G) =
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