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Question
The square root of $$\left( {7 + 3\sqrt 5 } \right)$$  $$\left( {7 - 3\sqrt 5 } \right)$$   is
Options:
A .  $$\sqrt 5 $$
B .  2
C .  4
D .  $$3\sqrt 5 $$
Answer: Option B

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