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In an entrance test,there are multiple choice questions.There are four possible answers to each question,of which one is correct.The probability that a student knows the answer to a question is 90%. If the gets the correct answer to a question,then find the probability that he was guessing.

In an entrance examinations there are multiple choice question. There are five possible answers to each question of which one is correct. The probability that a student knows the answer to a question is 80%. IF he gets the correct answer to the question, then the probability that he was guessing is

An instructor has a test bank consisting of 300 easy True/False questions, 200 difficult True/False questions, 500 easy multiple choice questions (MCQ) and 400 difficult multiple choice questions. If a questions is selected at random from the test bank, what is the probability that it will be an easy question given that it is a multiple choice question.

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