Let A = [aij] and B = [bij] be two square matrices of order n and det(A) denote the determinant of A. Then, which of the following is not correct:
1
If A is a diagonal matrix, then det(A) = a11 a22 ... ann.
2
det(AB) = det(A) det(B).
3
det(cA) = c [det(A)].
4
det(A) = det(AT), where AT denotes the transpose of the matrix A.