Question
Use sigma notation to write the sum.$$\frac{1}{1^{2}}-\frac{1}{2^{2}}+\frac{1}{3^{2}}-\frac{1}{4^{2}}+\dots-\frac{1}{20^{2}}$$
Step 1
We can see that the series is alternating between positive and negative terms, and each term is the reciprocal of the square of an integer. Show more…
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