Question
Find a formula for the general term $a_{n}$ of each of the following sequences.$$\{1,-1 / 3,1 / 5,-1 / 7, \ldots\}$$
Step 1
This can be represented by $(-1)^n$ or $(-1)^{n+1}$, depending on whether we want the sequence to start with a positive or negative term. In this case, we want the sequence to start with a positive term, so we use $(-1)^{n+1}$. Show more…
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