Question
Use summation notation to write each series.$$1-\frac{1}{4}+\frac{1}{9}-\frac{1}{16}+\cdots-\frac{1}{400}$$
Step 1
Also, we can see that the signs alternate between positive and negative. To represent the alternating signs, we can use the factor $(-1)^{n+1}$, which will be positive when n is even and negative when n is odd. Show more…
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