Answer
$\sum_{k=0}^{100}x^{k}$
Work Step by Step
We write the sum in sigma notation:
(We notice that the terms take the form $x^k$, with $k$ being consecutive integers.)
$1+x+x^{2}+x^{3}+ \cdots+x^{100}=\sum_{k=0}^{100}x^{k}$
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