First slide

Operations of matrix

Question

If $A = {[a_{ij}]}_{3 \times 3}$ and $a_{ij} = i (i + j)$ then trace of A.

Easy

Solution

$A = {[a_{ij}]}_{3 \times 3} a_{ij} = i (i + j) (\sin c e i = j) t r a c e o f A = 2 (1^{2} + 2^{2} + 3^{2}) = 28$

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