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OpenStudy (anonymous):
\[\sum_{?}^{?}\] (2+3n)
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OpenStudy (anonymous):
What are the limits? If 1 to x, Answer is $$2x+3 \frac{x(x+1)}{2}=\frac12(3x^2+5x)$$
OpenStudy (anonymous):
answer is 25,75,55,95
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