Answer: Becomes k x det.
- A Remains unchanged
- B Becomes det/k
- C Becomes k x det
- D Becomes k<sup>2</sup> x det
Correct answer: C. Becomes k x det
Explanation: Multiplying one row by k multiplies the determinant by k. New det = k x original det.
Concept context
Evaluation of determinants, cofactors, adjoint, inverse of matrix, Cramer's rule and area applications. Always in board and JEE.