$A=\left[\begin{array}{rr} 4 & -3
\\ 18 & -9 \end{array}\right] $ and
$B=\left[\begin{array}{rr} -\dfrac{1}{2} & \dfrac{1}{6}
\\\\-1 & \dfrac{2}{9} \end{array}\right]$
**Are $A$ and $B$ inverses?**
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