Ex 4.4, 5 - If Aij is Cofactor of aij then value of determinant - Ex 4.4

  1. Chapter 4 Class 12 Determinants
  2. Serial order wise
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Ex 4.4, 5 If ∆ = a11﷮a12﷮a13﷮a21﷮a22﷮a23﷮a31﷮a32﷮a33﷯﷯ and Aij is Cofactor of aij then value of ∆ is given by (A) a11 A31 + a12 A32 + a13 A33 (B) a11 A11 + a12 A21 + a13 A31 (C) a21 A11 + a22 A12 + a23 A13 (D) a11 A11 + a21 A21 + a31 A31 If ∆ = a11﷮a12﷮a13﷮a21﷮a22﷮a23﷮a31﷮a32﷮a33﷯﷯ ∆ = sum of products of elements of row (or column) with their corresponding cofactors ∆ = a11 A11 + a21 A21 + a31 A31 So, option B is correct

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