1. If there exists an n n matrix A1 such that AA1 = In = A1A,...
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2. A matrix that has an inverse is invertible or ________. A matrix that does not have an inverse is ________.
3. A 2 × 2 matrix is invertible if and only if its ________ is not zero.
4. If A is an invertible matrix, then the system of linear equations represented by AX = B has a unique solution given by X = ________.
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