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1. $\sqrt{x^{- 1}} y . \sqrt{y^{- 1} . z .} \sqrt{z^{- 1} . x}$

Answer: Option D

Explanation:

\sqrt{x^{- 1} y} . \sqrt{y^{- 1} . z} . \sqrt{z^{- 1} . x} = \sqrt{\frac{1}{x} \times y} . \sqrt{\frac{1}{y} \times z} . \sqrt{\frac{1}{z} \times x} = \sqrt{\frac{y}{x}} \times \sqrt{\frac{z}{y}} \times \sqrt{\frac{x}{z}} = \sqrt{\frac{y}{x} \times \frac{z}{y} \times \frac{x}{z}} = \sqrt{1} = 1

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