The expression $\frac{{\int }_0^n\left[x\right]dx}{{\int }_0^n\left\{x\right\}dx}$, where $\left[x\right]$ and $\left\{x\right\}$ are integral and fractional part of $x$ and $n\in N$, is equal to

• A

  $\frac{1}{n-1}$
• B

  $\frac{1}{n}$
• C

  $n$
• Correct answer
  D

  $n-1$

Hence, the correct answer is option: 'D'.