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Difficult

Exponent Values

GMAT-6NK2TF

$\frac{1}{7}$ becomes greater than $\frac{1}{\sqrt{7}}$ when taken to the power of all of the following exponents except:

A

$0.5$

B

$\cfrac{1}{\sqrt7}$

C

$0$

D

$\cfrac{-1}{2}$

E

$\cfrac{-1}{7}$