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Question Number 160254 by rexford last updated on 26/Nov/21

Answered by qaz last updated on 26/Nov/21

$$\underset{\mathrm{i}=0}{\sum ^{\mathrm{\infty }}}2\left(\frac{4}{5^{\mathrm{i}}}\right)=\frac{8}{1-\frac{1}{5}}=10$$

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