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15 June, 14:58

Suppose there are 10 multiple choice questions. each question has 5 choices, and only one of these is correct. what is the probability getting two or fewer correct answers, if you guess each answer at random.

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  1. 15 June, 15:08
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    The answer is (4/5) ^10 + [ (4/5) ^9] (1/5) (10) + [ (4/5) ^8][ (1/5) ^2] (45)
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