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Which one of the following is not equal ...

Which one of the following is not equal to `root(3)(8)^(-1/2)\ ` ?
(a)`root(3)(2)^(-1/2)`
(b) `8^(-1/6)`
(c) `1/(root(3)(8)^(1/8))`
(d) `1/(sqrt(2))`

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