यदि $f(a + b - x) = f(x)$ है,तो $\int_{a}^{b} x f(x) dx$ किसके बराबर है?

  • A
    $\frac{a+b}{2} \int_{a}^{b} f(b-x) dx$
  • B
    $\frac{a+b}{2} \int_{a}^{b} f(b+x) dx$
  • C
    $\frac{a+b}{2} \int_{a}^{b} f(x) dx$
  • D
    $\frac{b-a}{2} \int_{a}^{b} f(x) dx$

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