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The value of $$\sqrt {40 + \sqrt {9\sqrt {81} } }$$ is = ?
Answer & Solution
Correct Answer:
Option
C
$$\eqalign{
& \sqrt {40 + \sqrt {9\sqrt {81} } } \cr
& \Rightarrow \sqrt {40 + \sqrt {9 \times 9} } \cr
& \Rightarrow \sqrt {40 + 9} \cr
& \Rightarrow \sqrt {49} \cr
& \Rightarrow 7 \cr} $$
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