જો $n$ એ ધન પૂર્ણાંક હોય અને $[x]$ એ $x$ થી વધતો ન હોય તેવો મહત્તમ પૂર્ણાંક હોય,તો $\int_0^n {\{x - [x]\} \,dx}$ ની કિંમત શોધો.

  • A
    $n^2/2$
  • B
    $n(n - 1)/2$
  • C
    $n/2$
  • D
    $\frac{n^2}{2} - n$

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