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$\sum_{} \frac{1}{1 + x^{a - b} + x^{a - c}} =$

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Correct option is A

∑ 11+xa-b+xa-c=∑ xb+cxb+c+xc+a+xa+b =1xb+c+xc+a+xa+b∑ xb+c =1xb+c+xc+a+xa+bxb+c+xc+a+xa+b=1.

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