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OpenStudy (anonymous):
Write the sum in expanded form. n+3 sigma (j^7) j=n
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OpenStudy (anonymous):
\[\sum_{j=n}^{n+3} j^7 \]
Parth (parthkohli):
Substitute.\[\rm n^7 + (n + 1)^7 + (n + 2)^7 + (n + 3)^7\]
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