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search-thumbnail-$1-3$ $\sum  _{n=1} ^{5}\left(20-n^{2}\right)$ 
$4-6$ $\sum  _{n=1} ^{4}\dfrac {1} {3n}$ 
$7-9$ $\sum  _{n=1} ^{6}\dfrac {n^{2}+1} {n}$
10th-13th grade
Calculus
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