Question
Identify which one of the following statements is CORRECT:
The correct answer is
A -1 is equal to Adj (A) if the value of the determinant A is unity
For an invertible square matrix, \(A^{-1}=\frac{\operatorname{adj}(A)}{\det A}\). If det A =1, its inverse equals its adjugate. Interchanging two columns reverses the determinant’s sign, transposition leaves it unchanged, and ordinary scalar-style division is not a general matrix operation.
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