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But they are fractions

Algebra Level 2

$\large \frac { 1 }{ { 2 }^{ 3 } } +\frac { 1 }{ { 2 }^{ 6 } } +\frac { 1 }{ { 2 }^{ 9 } } + \cdots = \, ?$

\frac17

\frac16

\frac15

\frac14

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by K. J. W.

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