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OpenStudy (anonymous):
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OpenStudy (anonymous):
\[\sum_{i=1}^{27}3i\]
OpenStudy (turingtest):
\[\sum_{i=1}^ni=\frac{n(n+1)}2\]
OpenStudy (anonymous):
how about 3? what is 3
OpenStudy (anonymous):
i think u can use the formula |dw:1349188013144:dw|
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