the upper triangular matrix of the matri...

the upper triangular matrix of the matrix `[{:(1,-1,2), (2," 1",3),(3, " 2",4):}]` is

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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The correct Answer is:

A

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