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Question Number 140291 by ajfour last updated on 06/May/21

Commented by ajfour last updated on 06/May/21

$$S=a+\frac{a}{2}+\frac{a}{4}+\frac{a}{8}+.......$$$$=2a.$$

Commented by Dwaipayan Shikari last updated on 06/May/21

$$l^2=(a+\frac{a}{2}+\frac{a}{4}+..adinf)\Rightarrow l=\sqrt{2a}$$

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