The value of ${{15} \over {\sqrt {10} + \sqrt {20} + \sqrt {40} - \sqrt 5 - \sqrt {80} }}$ is
The value of ${{15} \over {\sqrt {10} + \sqrt {20} + \sqrt {40} - \sqrt 5 - \sqrt {80} }}$ is
- A
$\sqrt 5 (5 + \sqrt 2 )$
- B
$\sqrt 5 (2 + \sqrt 2 )$
- C
$\sqrt 5 (1 + \sqrt 2 )$
- D
$\sqrt 5 (3 + \sqrt 2 )$
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${{{{[4 + \sqrt {(15)} ]}^{3/2}} + {{[4 - \sqrt {(15)} ]}^{3/2}}} \over {{{[6 + \sqrt {(35)} ]}^{3/2}} - {{[6 - \sqrt {(35)} ]}^{3/2}}}} = $