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JEE MATHEMATICS MCQ: COMBINATIONS

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In an examination a candidate has to pass in each of the papers to be successful. It the total number of ways to fail is 63 , how many papers are there in the examination?

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Correct option: A

6

Option A (6) is correct because the total number of ways to fail or pass is 2^n, and subtracting the one way to pass (all papers passed) gives 63, leading to n=6.

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n