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The sum of 1^st n terms of the series (1^2/1) +(1^2+2^2/1+2) +(1^2 +2^2+3^2/1+2+3)+...

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The sum of 1st n terms of the series (12/1) +(12+22/1+2) +(12 +22+32/1+2+3)+...

(1) n(n +2)/3

(2) n(n -2)/6

(3) n+2/3

(4) n(n -2)/3

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Correct option (1) n(n +2)/3   

Explanation:

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