Ononot — Let A = \begin{pmatrix} 3 & 0 \\ 0 & 2 \end{pmatrix} and B =

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Let $A = \begin{pmatrix} 3 & 0 \\ 0 & 2 \end{pmatrix}$ and $B = \begin{pmatrix} 1 & 0 \\ 0 & 1 \end{pmatrix}$ . What is $\det(A + B)$ ?