Jambmaths question:
Find the determinant of $\left( \begin{matrix} 1 & 0 & 1 \\ 1 & 1 & 0 \\ 0 & 1 & 2 \\\end{matrix} \right)$
Option A:
3
Option B:
6
Option C:
4
Option D:
5
Jamb Maths Solution:
$\left| \begin{matrix} 1 & 0 & 1 \\ 1 & 1 & 0 \\ 0 & 1 & 2 \\\end{matrix} \right|=1\left| \begin{matrix} 1 & 0 \\ 1 & 2 \\\end{matrix} \right|-0\left| \begin{matrix} 1 & 0 \\ 0 & 2 \\\end{matrix} \right|+1\left| \begin{matrix} 1 & 1 \\ 0 & 1 \\\end{matrix} \right|=2-0+1=3$
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