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Choose the correct option.
If a matrix A = [a_(ij)]_(2 × 2), where a_(ij) = {1, i ≠ j; 0, i = j}, then A⁻¹ is:
If a matrix $A = [a_{ij}]_{2 \times 2}$, where $a_{ij} = \begin{cases} 1, & i \neq j \\ 0, & i = j \end{cases}$, then $A^{-1}$ is:
- (a)$I$
- (b)$A$
- (c)$-A$
- (d)$-I$
Answer
Answer
Official answer keyCorrect option: (b)
Answer: (b) $A$