Practicing Success

Target Exam

CUET

Subject

-- Mathematics - Section B1

Chapter

Determinants

Question:

If $A$ and $B$ are non singular square matrices of the same order, then which of the statements are true?

(A) $(adj A)(adj B)=(adj B)(adj A)$
(B) $(AB)^{T}=A^{T} B^{T}$, if $A^{T}$ denotes transpose of $A$
(C) $(AB)^{-1}=B^{-1} A^{-1}$
(D) Multiplication of matrices is not commutative

Choose the correct answer from the options given below :

Options:

(A) and (C) Only

(A) and (D) Only

(B) and (C) Only

(C) and (D) Only

Correct Answer:

(C) and (D) Only

Explanation:

(A) (adj A)(adj B) = (adj B)(adj A)

This is false as matrix multiplication is not commutative.

(B) $(A B)^{T}=A^{T} B^{T}$, this is false as $(A B)^{T}=B^{T} A^{T}$

(C) → This is true

(D) → This no true