Hi

three multiple-choice questions. Each has one corect answer

first question has four possible answers

the second question has five possible answers

third question has six possible answers

P(answering 1 & 2 correctly & 3 incorrectly) = 1/4*1/5*5/6

P(at least one question is answered correctly) = 1 - P(none) = 1 - 3/4*4/5*5/6 

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