Concours ENSPY Practice Questions - Concours ENSPY - École Nationale Supérieure Polytechnique De Yaoundé (Cameroon) Exam

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What is the determinant of the $3 \times 3$ real matrix $A = \begin{pmatrix} 2 & 1 & 3 \\ 0 & 4 & -1 \\ 0 & 0 & 5 \end{pmatrix}$?
Correct Answer:
40

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