Question

If A is a square matrix, then adj (A)' - (adj A') is equal to

• A. $2\left|A\right|$
• B. $2\left|A\right|I$
• C. null matrix
• D. unit matrix

Answer 1

Answer: (C)

We know that (Adj A) = (Adj A)'
$\therefore$ Adj (A') - (Adj A)' = 0 (null matrix)