Answer: (-1) i+j x Minor Mij.
- A Minor Mij directly
- B (-1)<sup>i+j</sup> x Minor Mij
- C det(A) x (-1)<sup>i</sup>
- D Element a<sub>ij</sub> x (-1)<sup>i+j</sup>
Correct answer: B. (-1)<sup>i+j</sup> x Minor Mij
Explanation: Cofactor Cij = (-1)<sup>i+j</sup> x Mij, where Mij is the determinant of the submatrix formed by deleting row i and column j.
Concept context
Evaluation of determinants, cofactors, adjoint, inverse of matrix, Cramer's rule and area applications. Always in board and JEE.