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If a ,\ b ,\ c are positive real numbers...

If `a ,\ b ,\ c` are positive real numbers, then `sqrt(a^(-1)b)\ xx\ sqrt(b^(-1)\ c)\ xx\ sqrt(c^(-1)a)` is equal to: `(a)\ 1` (b) `a b c` (c) `sqrt(a b c)` (d) `1/(a b c)`

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