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OpenStudy (anonymous):
Write out all terms and compute the sums.
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OpenStudy (anonymous):
OpenStudy (anonymous):
@Mertsj can u help please?
OpenStudy (anonymous):
\[\sum_{i=1}^{6}3i^2=3\sum_{i=1}^{6}i^2=3[1^2+2^2+3^2+4^2+5^2+6^2]\]\\[=3[1+4+9+16+25+36]=3(91)=273\]
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