We have studied about matrices before, like,

Determinant is a special number calculated from
**
square matrix
**

So, determinant of matrix A & B is possible

But

Determinant’s of matrix C is
**
not possible
**

Because matrix C is not a
**
square
**
**
matrix
**

For matrix A,

We denote determinant as

det A

or

det (A)

or

|A|