JEE · Matrices & Determinants · Foundations
Matrices & Determinants: Trace of math?
2×2 determinants, Cramer's rule peek.
Try the problem
Trace of ?
Hint and answer
Concept to use
$\det\begin{pmatrix}a&b\\c&d\end{pmatrix}=ad-bc$.
Hint
Diagonal sum.
Answer
7
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