The sum of the cofactors of the elements of second row of the matrix [ array ccc 1 & 3 & 2 -2 & 0 & 1 5 & 2 &1 array ] is

Step-by-step solution

(B) Co-factors of second row of matrix are array l A₂₁=(-1)²⁺¹ | array ll 3 & 2 2 & 1 array |=(-1)³(-1)=1 A₂₂=(-1)²⁺² | array ll 1 & 2 5 & 1 array |=(-1)⁴(-9)=-9 A₂₃=(-1)²⁺³ [ array ll 1 & 3 5 & 2 array ]=(-1)⁵(-13)=13 Their sum =A₂₁+A₁₂+A₂₃=1-9+13=5 array