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In A = [(2,3,10)(4,-6,5)(6,9,-20)] find A-1 Using A-1 solve the system of equations 2/x+3/y+10/z = 2, 4/x+6/y+5/z = 5; 6/x+9/y+20/z = 4

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Here     |A|  = 1200

Co-factors are

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