If \( 1+2+3+\ldots+n=28 \), then find the value of \[ 1^{2}+2^{2}+3...

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If \( 1+2+3+\ldots+n=28 \), then find the value of
\[
1^{2}+2^{2}+3^{2}+\ldots+n^{2} \text {. }
\]
\( \mathrm{W} \)
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