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Online ProgramGrant was asked to give the inverse of the following matrix \(\left[ \begin{array}{cc} 3 & 6 \\ 1 & -7 \end{array} \right].\) His answer was \(\left[ \begin{array}{cc} -7 & -6 \\ -1 & 3 \end{array} \right]. \)This is incorrect for the inverse matrix. What was Grant's mistake and give the correct inverse matrix?