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14 July, 14:39

A multiple choice quiz consists of 10 questions. each question has 4 choices and 1 correct answer. if a person randomly chooses a choice from each question, what is the probability that he gets at least 3 questions right

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  1. 14 July, 16:43
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    The probability is

    1 - (0.75) ^10 - 10 (0.25) (0.75) ^9 - 45[ (0.25) ^2][ (0.75) ^8]
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