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Can a matrix X exist with AX = I when A has rows (1, 2) and (2, 4)?
AYes, for every A
BYes, if X is large
COnly if X is square
DNo, since |A| = 0
Answer & Solution
Correct answer: D. No, since |A| = 0
The determinant is 4 - 4 = 0, so A is singular and no matrix can multiply it to give the identity.
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