If A={:[(1,0,-1),(3,4,5),(0,6,7)]:}" and...

If `A={:[(1,0,-1),(3,4,5),(0,6,7)]:}" and "A^(-1)=[alpha_(ij)]_(3xx3)," then "alpha_(23)=`

`(21)/(20)`

`(1)/(5)`

`-(2)/(5)`

`(2)/(5)`

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