Question
Use a formula for $S_{n}$ to evaluate each series.$$\sum_{i=1}^{11}\left(\frac{1}{2} i-1\right)$$
Step 1
We can do this by substituting $i=1$ into the formula $\frac{1}{2} i-1$. This gives us $\frac{1}{2} \times 1 - 1 = -\frac{1}{2}$. Show more…
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