DeterminantHard

Question

Let A = be a matrix, then (det A) x (adj A-1) is equal to

Options

A.O3 × 3
B.I3
C.
D.

Solution

| A | . (adj (A-1)) = | A | (|A-1| . (A-1)- 1) = | A A-1| . A = A.

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