MathematicsIf the matrix A=14−32−56 , then a11+a22+a32=___

If the matrix $A = [\begin{matrix} 1 & 4 \\ - 3 & 2 \\ - 5 & 6 \end{matrix}]$ , then $a_{11} + a_{22} + a_{32} =$ ___

A
9
B
12
C
32
D
5

Solution:

$a_{11} + a_{22} + a_{32} = 1 + 2 + 6 = 9$

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Type of relations_mathematics