Ex 4.3, 5 If ∆ = |■8(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 A1 2 + a23 A13 (D) a11 A11 + a21 A21 + a31 A31 If ∆ = |■8(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 D is correct

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.