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Write A^(-1) for A=[2 5 1 3]...

Write `A^(-1)` for `A=[2 5 1 3]`

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For elementary row operations, we write
`A=IA `
⇒`[(2,5),(1,3)​]` =`[(1,0),(​0,1)​]A`
⇒`[(1,3),(​2,5)​] ...
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