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Determine inverse matrices

Problem

A=[3119]A=\left[\begin{array}{rr} 3 & -1 \\ -1 & 9 \end{array}\right] and B=[926126126326]B=\left[\begin{array}{rr} \dfrac{9}{26} & \dfrac{1}{26} \\\\ \dfrac{1}{26} & \dfrac{3}{26} \end{array}\right]
Are A and B inverses?
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