Test Academy | Which of the following formula is incorrect? A(adj A)=|A|I, |adj (A)|=|A|ⁿ⁻¹, for an nᵗʰ order matrix, A⁻¹=1|A| adj A, A(adj A)= |A|ⁿ⁻¹

Question

Which of the following formula is incorrect?

Options :

A(adj A)=|A|I
|adj (A)|=|A|ⁿ⁻¹, for an nᵗʰ order matrix
A⁻¹=1|A| adj A
A(adj A)= |A|ⁿ⁻¹

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