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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- [KVPY 2012]
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If ${x^y} = {y^x},$then ${(x/y)^{(x/y)}} = {x^{(x/y) - k}},$ where $k = $
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