Answer
$x^{3}+x^{4}+x^{5}+x^{6}+...+x^{100}$
Work Step by Step
We expand the sum:
$\sum_{k=3}^{100}x^{k}=x^{3}+x^{4}+x^{5}+x^{6}+...+x^{100}$
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