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OpenStudy (anonymous):
Integrated math...need help explaining?
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OpenStudy (anonymous):
This is new to me...??
OpenStudy (xapproachesinfinity):
that symbol means sum you sum from k=1 to k=4 \(\LARGE \tt\color{blueviolet}{\sum_{k=1}^{4}\frac{9}{5^{k-1}}=\frac{9}{5^0}+\frac{9}{5^1}+\frac{9}{5^2}+\frac{9}{5^3}}\)
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