Question

If $A = \begin{bmatrix}1&-5&7\\\ 0&7&9\\\ 11&8&9\end{bmatrix}$, then trace of matrix $A$ is

• A. 17
• B. 25
• C. 3
• D. 12

Answer 1

Answer: (A)

17

Answer 2

The correct answer is A:17
Given;
$\therefore$ If $A = \begin{bmatrix}1&-5&7\\\ 0&7&9\\\ 11&8&9\end{bmatrix}$,then
New trace of A=sum of diagonal elements of A
$(A) = 1 + 7 + 9 = 17$