$- 2^{- 3}$ can also be expressed as:

\frac{1}{8}

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- \frac{1}{8}

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8

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- 8

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Solution

The correct option is A $- \frac{1}{8}$
$- 2^{- 3} = \frac{1}{- 2 \times - 2 \times - 2} = - \frac{1}{8}$

So, option B is correct.

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