Discussion
How is the adjoint of a matrix formed?
Answer: C
Correct answer: as the transpose of the matrix of cofactors
Two steps in order: replace each entry by its cofactor - the minor with the sign \( (-1)^{i+j} \) - and then transpose. Omitting the signs gives the matrix of minors, and omitting the transpose gives the cofactor matrix itself; both are offered here. The adjoint earns its place through \( A^{-1} = \mathrm{adj}(A)/|A| \).
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