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Question
If $$\sqrt {x + \frac{x}{y}} = x\sqrt {\frac{x}{y}} {\text{,}}$$     where x and y are positive real numbers, then y is equal to ?
Options:
A .  $${\text{x}} + 1$$
B .  $${\text{x}} - 1$$
C .  $${{\text{x}}^2} + 1$$
D .  $${{\text{x}}^2} - 1$$
Answer: Option D

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