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# If A is invertible matrix of order $3\times 3$,then $| A^{-1} |$___________.

If A is invertible matrix of order $3\times 3$,then |A|$\neq 0$
$A.A^{-1}=I$
$\Rightarrow A^{-1}=\frac{1}{A}.I$
$|A^{-1}|=\frac{1}{|A|}|I|$
Therefore $|A^{-1}|=\frac{1}{|A|}$