Let A be a nonsingular square matrix of order 3 × 3 Then |adj A| is equal to
(A) | A |
(B) | A |2
(C) | A |3
(D) 3|A|
18 If A is an invertible matrix of order 2, then det (A–1) is equal to
(A) det (A)
(B)
1
det (A)
(C) 1
(D) 0
4 6  Applications of Determinants and Matrices
In this section, we shall discuss application of determinants and matrices for solving the
system of linear equations in two or three variables and for checking the consistency of
the system of linear equations