Question

If $A=\left[\begin{array}{cc}a& b\\ c& d\end{array}\right]$, then determinant of $A$ is written as

• A. $|A|=\left[\begin{array}{cc}a& b\\ c& d\end{array}\right]$
• B. $|A|=\left[\begin{array}{cc}a& c\\ d& b\end{array}\right]$
• C. $|A|=\left[\begin{array}{cc}a& c\\ b& d\end{array}\right]$
• D. $|A|=\left[\begin{array}{cc}a& b\\ d& c\end{array}\right]$

Answer 1

Answer: (A)

If $A=\left[\begin{array}{cc}a& b\\ c& d\end{array}\right]$, then determinant of $A$ is written as
$|A|=\left|\begin{array}{cc}a& b\\ c& d\end{array}\right|=\text{det}(A)$