question_answer

 If re, ,y, z are positive real numbers and a, b, c are rational numbers, then the value of \[\frac{1}{1+{{x}^{b-a}}+{{x}^{x-a}}}+\frac{1}{1+{{x}^{a-b}}+{{x}^{c-b}}}+\frac{1}{1+{{x}^{b-c}}+{{x}^{a-c}}}\]

A)  - 1                                         

B)  1  

C)  0                            

D)         None of these