$${\left[ {{{\left( {\sqrt {81} } \right)}^2}} \right]^2} = {\left( ? \right)^2}$$ Options: A . &nbsp8 B . &nbsp9 C . &nbsp4096 D . &nbsp6561 E . &nbspNone of these

$${\left[ {{{\left( {\sqrt {81} } \right)}^2}} \right]^2} = {\left( ? \right)^2}

Question

$${\left[ {{{\left( {\sqrt {81} } \right)}^2}} \right]^2} = {\left( ? \right)^2}$$

Answer: Option E
$$\eqalign{
& {\text{Let,}} \cr
& {\left[ {{{\left( {\sqrt {81} } \right)}^2}} \right]^2} = {\left( x \right)^2} \cr
& {\text{Then,}} \cr
& \Leftrightarrow {x^2} = {\left( {81} \right)^2} \cr
& \Leftrightarrow x = 81 \cr} $$

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