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 Rationalised 2023-24
 94
MATHEMATICS
Consistent system A system of equations is said to be consistent if its solution (one
or more) exists