1.

By what number should\[{{\left( \frac{1}{8} \right)}^{-1/2\ }}\] be multiplied so that its product becomes \[{{\left( \frac{5}{7} \right)}^{-1/2\ }}\] ?

A. \[{{\left( \frac{7}{40} \right)}^{-1/2\ }}\]             
B. \[\frac{\sqrt{7}}{2\sqrt{2}}\]     
C. \[\frac{\sqrt{70}}{20}\]            
D. \[\frac{\sqrt{70}}{40}\]
E.  None of these
Answer» D. \[\frac{\sqrt{70}}{40}\]


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