Show that the given matrices are inverses in Problems 19-20. ([A]=left[begin{array}{ll}2 & 7 1 & 4end{array}ight]
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Show that the given matrices are inverses in Problems 19-20.
\([A]=\left[\begin{array}{ll}2 & 7 \\ 1 & 4\end{array}ight] ;[B]=\left[\begin{array}{rr}4 & -7 \\ -1 & 2\end{array}ight]\)
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