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OpenStudy (mary.rojas):
1+2+3+4+5+6+7+8+9+10+11+12+13=
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OpenStudy (alienium):
90
OpenStudy (mimi_x3):
\[\frac{n(n+1)}{2} = \frac{13(13+1)}{2} \]
OpenStudy (mary.rojas):
OMG @Mimi_x3 BINGOOOO!!!!
OpenStudy (mimi_x3):
:)
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