Question

If A = [aij] = [[2, -1, 5], [1, 3, 2], [5, 0, 4]] and cij is the cofactor of element aij, then the value of a21 · c11 + a22 · c12 + a23 · c13 is :

Find the minor of element 6 in the determinant Δ = |1 2 3; 4 5 6; 7 8 9|

Find minors and cofactors of all the elements of the determinant |1 -2; 4 3|

Find minors and cofactors of the elements a11, a21 in the determinant Δ = |a11 a12 a13; a21 a22 a23; a31 a32 a33|