Question

$4 \sqrt{81 } ^{ - 2}$
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Answer 1

$\huge\tt\blue {Question }$

$4 {\sqrt{81}}^{ - 2}$

$\huge\tt\purple {Answer }$

$4 {\sqrt{ \frac{1}{81} }}^{2}$

$4 \times { \frac{1}{9} }^{2}$

$4 \times \frac{1}{81}$

$\frac{4}{81}$