Consider a square matrix and
In this case, all of the elements in the third column of the matrix B and the first row of the matrix A are zero.
Since all of the elements in a row or column must be zero for the determinant of a matrix to be zero.
Therefore, |A|=0 and |B|=0
A matrix is referred to as a singular matrix if its determinant is zero.
Hence, the square matrices A and B are singular.
Answer is given below (on video)
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