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OpenStudy (anonymous):
Rewrite the sum z+2z^2+3z^3+4z^4+5z^5+6z^6 using sigma notation.
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OpenStudy (mr.math):
\[z+2z^2+3z^3+4z^4+5z^5+6z^6=\sum_{n=1}^6 nz^n.\]
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