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The upper triangular matrix of the matri...

The upper triangular matrix of the matrix `[[1,-1,2],[2,1,3],[3,2,4]]`

A

`[[1,-1,2],[0,3,-1],[0,0,-1]]`

B

`[[1,1,-2],[0,3,-1],[0,0,-1/3]]`

C

`[[-1/3,0,0],[3,-1,0],[-1,2,0]]`

D

`[[1,1,2],[0,-3,-1],[0,0,-1/3]]`

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