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Using elementry transformation, find the...

Using elementry transformation, find the inverse of the matrix. `[{:(,0,1,2),(,1,2,3),(,3,1,1,):}]`

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The correct Answer is:
`A^(-1)=[{:(,1//2,-1//2,1//2),(,-4,3,-1),(,5//2,-3//2,1//2):}]`
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