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Question
What is $$\frac{{5 + \sqrt {10} }}{{5\sqrt 5 - 2\sqrt {20} - \sqrt {32} + \sqrt {50} }}$$      equal to ?
Options:
A .  5
B .  $$5\sqrt 2 $$
C .  $$5\sqrt 5 $$
D .  $$\sqrt 5 $$
Answer: Option D

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