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Find 1/2, (1^2 + 2^2) / 3, (1^2 + 2^2 + ...

Find `1/2`, `(1^2 + 2^2) / 3`, `(1^2 + 2^2 + 3^2) / 4`, `(1^2 + 2^2 + 3^2 + 4^2) / 5`, ……. Upto 'n' terms.

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