If A= ((1,0,0),(2,1,0),(3,2,1)), U(1), U...

If `A= ((1,0,0),(2,1,0),(3,2,1)), U_(1), U_(2), and U_(3)` are column matrices
satisfying `AU_(1) =((1),(0),(0)), AU_(2) = ((2),(3),(0))and AU_(3) = ((2),(3),(1))` and
`U` is `3xx3` matrix when columns are`U_(1), U_(2), U_(3)` then
answer the following questions
The sum of the elements of `U^(-1)` is

-1

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