Question

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)/(3)):}]`
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)):}]`

Answer 1

Correct Answer - A