If A is a square matrix of order 2, then

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Home Questions 7RZD478Q83

Target Exam

CUET

Subject

-- Mathematics - Section A

Chapter

Matrices

Question:

If A is a square matrix of order 2, then |adj A| is equal to :

Options:

$|A^{-1}|$

$|A|$

$|A|^2$

$\frac{1}{|A|}$

Correct Answer:

$|A|$

Explanation:

The correct answer is Option (2) → $|A|$

n → order of A

$|adj\, A|=|A|^{n-1}$

here $|adj\, A|=|A|^{2-1}=|A|$