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If the sum of first ‘n' natural numbers ...

If the sum of first `‘n'` natural numbers is `(n(n+1))/2.` Then, what will be the sum of first `'n'` terms of the series of alternate positive and negative numbers when `'n'` is even? `1^2-2^2 + 3^2-4^2+5^2-....`

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