The sum of the series \( 1^{2}+2^{2}+3^{2}+\ldots . n^{2} \) is....
The sum of the series \( 1^{2}+2^{2}+3^{2}+\ldots . n^{2} \) is
\( \mathrm{P} \)
(1) \( n(n+1)(2 n+1) \)
(2) \( n(n+1)(2 n+2) \)
(3) \( n(n+1)(2 n+1) / 3 \)
(4) \( n(n+1)(2 n+1) / 6 \)
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