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Mathematics 18 Online
OpenStudy (anonymous):

Evaluate the series n = 3 sum eight 5n.

OpenStudy (anonymous):

\[\sum_{n=3}^{8} 5n\]

OpenStudy (anonymous):

\[\sum_{3}^{8} 5n = 5\times3+5\times4+5\times5+5\times6+5\times7+5\times8=5\times33=165\]

OpenStudy (anonymous):

what ravikr.iit says is correct

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