The value of the $\begin{vmatrix}3 & -4 & 5\\1 & 1 & -2\\2 & 3 & 1\end{vmatrix} $ is :
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 46
$\begin{vmatrix}3 & -4 & 5\\1 & 1 & -2\\2 & 3 & 1\end{vmatrix}$
$=3(1+6)+4(1+4)+5(3-2)$
$=3×7+4×5+5×1$
$=21+20+5$
$=46$