Answer: 1.
- A 1
- B 0
- C 2
- D −1
Correct answer: A. 1
Explanation: The identity matrix [[1,0],[0,1]] has determinant 1×1 − 0×0 = 1.
Concept context
Evaluation of determinants, cofactors, adjoint, inverse of matrix, Cramer's rule and area applications. Always in board and JEE.