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OpenStudy (anonymous):
express in sigma notation. 2/5+6/5+18/5+54/5+162/5
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OpenStudy (paxpolaris):
\[\huge \sum_{0}^{4} {2\left( 3 \right)^n \over 5}\]
OpenStudy (anonymous):
ya. thanks
OpenStudy (anonymous):
Removing the constants from the sum might improve the notation a touch....\[2/5\sum_{k=0}^{4}3^{k}\]
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