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Question Number 81874 by zainal tanjung last updated on 16/Feb/20

$$\mathrm{If}A=\left[\begin{array}{ccc}1& -5& 7\\ 0& 7& 9\\ 11& 8& 9\end{array}\right]\mathrm{then}\mathrm{trace}\mathrm{of}$$$$\mathrm{matrix}A\mathrm{is}$$

Commented by jagoll last updated on 16/Feb/20

$$trc\left(A\right)=17$$

Commented by mathmax by abdo last updated on 16/Feb/20

$$tr\left(A\right)=\mathrm{\Sigma }{a}_{ii}=1+7+9=17$$

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