Question 132

If $$A = \begin{bmatrix}7 & 1 & 5 \\3 & 1 & -2 \\-4 & 3 & 2 \end{bmatrix}, B = \begin{bmatrix}1 & 4 & -6 \\2 & -1 & 5 \\7 & 0 & -3 \end{bmatrix}$$ then the trace of the matrix AB is


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