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For a matrix A((1,0,0),(2,1,0),(3,2,1)) ...

For a matrix `A((1,0,0),(2,1,0),(3,2,1))` if `U_(1),U_(2)` and `U_(3)` are `3xx1` column matrices satisfysing `AU_(1)=((1),(0),(0)),AU_(2)=((2),(3),(0)),AU_(3)=((2),(3),(1))` and U is `3xx3` matrix whose columns are `U_(1),U_(2)` and `U_(3)`. Then sum of the elements of `U^(-1)` is

A

6

B

0 (zero)

C

1

D

2//3

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