Answer: 0.
- A 1
- B Equal to the row sum
- C 0
- D Negative
Correct answer: C. 0
Explanation: If two rows (or two columns) of a matrix are identical, the determinant equals 0. Swapping them should negate det, but since they are identical, det = -det, so det = 0.
Concept context
Evaluation of determinants, cofactors, adjoint, inverse of matrix, Cramer's rule and area applications. Always in board and JEE.