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OpenStudy (anonymous):
write in sigma notation this infinite series -5, -10, -15, -20...
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OpenStudy (anonymous):
whats sigma?
OpenStudy (anonymous):
-25
OpenStudy (anonymous):
\[\sum_{1}^{n}(-5 - 5(n-1))\]
OpenStudy (anonymous):
ooooo haha ur smart! ☻
OpenStudy (anonymous):
\[-5\sum_{0}^{n} (n)\]
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OpenStudy (anonymous):
\[= -5(n)(n+1)/2\]
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