Answer
-$\frac{1}{3}$, $\frac{1}{9}$, -$\frac{1}{27}$, $\frac{1}{81}$
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:
$a_{1}$=-$\frac{1}{3}^{1}$
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