Let A = [(1,0,0), (2,1,0), (3,2,1)], and...

Let `A = [(1,0,0), (2,1,0), (3,2,1)],` and `U_1, U_2 and U_3` are columns of a `3 xx 3` matrix `U`. If column matrices `U_1, U_2 and U_3` satisfy `AU_1 = [(1),(0),(0)], AU_2 = [(2),(3),(0)], AU_3 = [(2),(3),(1)]` then the sum of the elements of the matrix `U^(-1)` is

0(zero)

`2//3`

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