1.

If the system of equations ax+ay-z=0 bx-y+bz=0 -x+cy+cz=0 (where a,b,c!=-1) has a non trivial solution, then values of 1/(1+a)+1/(1+ b)+1/(1+c) is

Answer»

2
`-1`
`-2`
`0`

ANSWER :A


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