By Principle of Mathematical Induction, prove that
\[
1^{2}+2^{2}+3^{2}+\ldots \ldots \ldots+n^{...
By Principle of Mathematical Induction, prove that
\[
1^{2}+2^{2}+3^{2}+\ldots \ldots \ldots+n^{2}=\frac{1}{6} n(n+1)(2 n+1) .
\]
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