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`a ,b ,c` are distinct real numbers not equal to one. If `a x+y+z=0,x+b y+z=0, and x+y+c z=0` have non trivial solution, then the value of `1/(1-a)+1/(1-b)+(1)/(1-c)` is equal to a.`1` b. `-1` c.`z e ro` d. none of these

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