Let Δ be the determinant of a matrix A, where
A = | a₁₁ a₁₂ a₁₃ |
| a₂₁ a₂₂ a₂₃ |
| a₃₁ a₃₂ a₃₃ |
and C₁₁, C₁₂, C₁₃ be the cofactors of a₁₁, a₁₂, a₁₃ respectively.
What is the value of a₂₁C₁₁ + a₂₂C₁₂ + a₂₃C₁₃ ?
Mathematics
2022
NDA Mathematics 2022
NDA 2022
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