Q 1166467375.     Let the homogeneous system of linear equation `px+y +z=0, x+qy+z=0 and x+y+rz=0`, where `p,q,r!=1,` have a non-zero solution, then the value of `1/(1-p)+1/(1-q)+1/(1-r)` is :

A

`-1`

B

`0`

C

`2`

D

`1`

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