A) \[\sqrt{5}\]
B) 2
C) 4
D) \[3\sqrt{5}\]
Correct Answer: B
Solution :
\[\sqrt{(7+3\sqrt{5})(7-3\sqrt{5})=\sqrt{49-9\times 5}}\] \[=\sqrt{49-45}\] \[=\sqrt{4}=2\]
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