यदि $f(x)=|x-1|+|x-2|+|x-3|, \forall x \in[1,4]$ है,तो $\int_1^4 f(x) dx=$

  • A
    $\frac{1}{2}$
  • B
    $7$
  • C
    $\frac{9}{2}$
  • D
    $\frac{19}{2}$

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