NCERT Example 10 - Determinants

Question: Find minors and cofactors of a11 and a21 in the general 3x3 determinant [aij].

Answer: M11=a22 a33-a23 a32 with A11=M11; M21=a12 a33-a13 a32 with A21=-(a12 a33-a13 a32).

Full step-by-step NCERT solution with diagrams on Something by Zero.

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