Ask iit jee aieee pet cbse icse state board community Discussion Response Post to: Probability q
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zuberahmed (32)

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no of ways in which the candidate can answer = 2^4 - 1=15 therefore the probability that he ticks the correct answer is 1/15 in three attemts the probability is 1/15 +1/15 +1/15 = 1/5
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