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Let A = (a) (b) 3 2 1 1 102 2 which is known to be nonsingular. Find A-1. Express A as a product

Let A = (a) (b) 3 2 1 1 102 2 which is known to be nonsingular. Find A-1. Express A as a product of finitely many 3 x 3 elementary matrices.

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