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\begin{align*}ยฌ
ยทยทยทยทK&=\frac{E}{(1+i)^r}\biggl(\underbrace{1+\frac{1}{(1+
i)^{g}}+\frac{1}{(1+i)^{2g}}+\frac{1}{(1+i)^{3g}}+\dots+\
frac{1}{(1+i)^{(n-1)g}}+\frac{1}{(1+i)^{ng}}}_{\mathlarge
r{S}}\biggr)ยฌ
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