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OpenStudy (anonymous):
What is the equation for a sequence that goes 0,1,3,6,10,15 (+1, +2, +3, +4 .....)
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OpenStudy (nikvist):
\[S_1=0\]\[S_2=0+1=1\]\[S_3=0+1+2=3\]\[\vdots\]\[S_n=0+1+2+\cdots+(n-1)=\frac{n(n-1)}{2}\]
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