_ n [ 1 n^2 ^2 1 n^2 + 2 n^2 ^2 4 n^2 + 3 n^2 ^2 9 n^2 + + 1 n ^2 1 ] equals

JEE Advanced Mathematics question

[++++ 1]

equals

Answer: (C)

The -th term is , (the last term is

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Question ID VK-110137