InterviewSolution
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                                    If the system of linear equations ax+by+cz=0 cx+ay+bz=0 bx+cy+az=0 where a,b,c in R are non-zero and distinct , has a non-zero solution, then : | 
                            
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Answer»  a+B+C=0 `RARR (a^2-bc)-b(ac-b^2)+c(c^2-ab)=0 rArr a^3 -abc-abc+b^3+c^3-abc=0` `rArr a^3+b^3+c^3-3abc=0 rArr (a+b+c)(a^2+b^2+c^2-ab-b-ca)=0` `rArr` a+b+c=0  | 
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