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For the matrix with rows (1, 2) and (3, 4), A(adj A) equals which matrix?
A2 times the identity
B-2 times the identity
C4 times the identity
D-4 times the identity
Answer & Solution
Correct answer: B. -2 times the identity
The determinant is 4 - 6 = -2, and A(adj A) equals the determinant times the identity.
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