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CIL 2026 | System | Question: 40

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Which of the following correctly represents the cofactor expansion of a $3 \times 3$ determinant along the first row?

  1. Sum of only diagonal elements times their cofactors
  2. Sum of elements of the first column times their cofactors
  3. Sum of each element of the first row times its corresponding cofactor
  4. Difference of elements of the first row and their cofactors

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