If matrix [(1,2,-1),(3,4,5),(2,6,7)] and...

If matrix `[(1,2,-1),(3,4,5),(2,6,7)]` and its inverse is denoted by `A^(-1)=[(a_(11),a_(12),a_(13)),(a_(21),a_(22),a_(23)),(a_(31),a_(32),a_(33))]` value of `a_(32)=`

21/20

`1//5`

`-2//5`

`2//5`

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