# arrow_back $$\text { Let } A \text { be the matrix, } A=\left[\begin{array}{lll} 3 & 2 & 1 \\ 0 & 4 & 5 \\ 0 & 0 & 2 \end{array}\right]$$ By inspection, $\operatorname{det}(A)$ is:

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$$\text { Let } A \text { be the matrix, } A=\left[\begin{array}{lll} 3 & 2 & 1 \\ 0 & 4 & 5 \\ 0 & 0 & 2 \end{array}\right]$$ By inspection, $\operatorname{det}(A)$ is:

A. $-24$

B. $-4$

C. 0

D. 4

E. 24

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