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  3. a 13 points find a 4 x 4 matrix c such that i c is

a 13 points Find a 4 x 4 matrix C such that i C is...

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Algebra

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a 13 points Find a 4 x 4 matrix C such that i C is not invertible and ii every entry of C is nonzero b 12 points Does there exist a 5x2 matrix A and a 2x5 matrix B such that AB is invert Either provide a 5x2 matrix A and a 2x5 matrix B such that AB is invertible or other show that for every 5x2 matrix A and every 2x5 matrix B the product AB is not invert

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