Answer
$\frac{1}{3}, -\frac{1}{5}, \frac{1}{9}, -\frac{1}{17}$
Work Step by Step
To find first four terms of the sequence, we will the number from 1 to 4 and put it into equation.
example:
$a_{1}=\frac{(-1)^{1+1}}{2^{1}+1}$
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