Answer: (-1)i+j x Minor Mij.
- A Minor Mij directly
- B (-1)i+j x Minor Mij
- C det(A) x (-1)i
- D Element aij x (-1)i+j
Correct answer: B. (-1)i+j x Minor Mij
Explanation: Cofactor Cij = (-1)i+j 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.