If n is a positive integer, then ( 3 + 1)^ 2n - ( 3 - 1)^ 2n is

JEE Main 2012 Mathematics question

If n is a positive integer, then is

Answer: (1)

In the difference, the terms with even powers of √3 cancel and those with odd powers double: \binom{2n}{1}\sqrt$ +

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Question ID VK-103780