Question

Which of the following is not correct?
(A) If A, B are two matrices such that AB = A and BA=B, then A and B are idempotent.
(B) Every skew - symmetric matrix of odd order is invertible.
(C) If A is a non-singular matrix, then A-1 is skew-symmetric.
(D) The adjoint of a diagonal matrix is a diagonal matrix.
Choose the correct answer from the options given below :

• A. (A) and (D) only
• B. (A), (B) and (C) only
• C. (B), (C) and (D) only
• D. (C) and (D) only

Answer 1

Answer: (B)

(A), (B) and (C) only

Answer 2

The correct answer is(B): (A), (B) and (C) only