The rationalising factor of $2\sqrt 3 - \sqrt 7 $ is
The rationalising factor of $2\sqrt 3 - \sqrt 7 $ is
- A
$\sqrt 3 + \sqrt 7 $
- B
$2\sqrt 3 + \sqrt 7 $
- C
$\sqrt 3 + 2\sqrt 7 $
- D
None of these
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${{\sqrt {6 + 2\sqrt 3 + 2\sqrt 2 + 2\sqrt 6 } - 1} \over {\sqrt {5 + 2\sqrt 6 } }}$
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${4 \over {1 + \sqrt 2 - \sqrt 3 }} = $
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