alleryThe value of $\begin{vmatrix} 1 & 0 & 1 \\ 0 & 1 & 2 \\ 0 & 0 & 4 \end{vmatrix}$ is:
A7
B4
C0
D1
Answer & Solution
Correct answer: B. 4
Upper-triangular determinant = product of diagonal entries = 1·1·4 = 4.
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