If A={:((3,1),(-1,2)):}, I={:((1,0),(0,1...

If `A={:((3,1),(-1,2)):}`, `I={:((1,0),(0,1)):}` and `O={:((0,0),(0,0)):},` show that `A^(2)-5A+7I= o`. Hence find `A^(-1).`

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The correct Answer is:

`1/7{:[(2,-1),(1,3)]:}`

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