$\sum\limits_{i=1}^n \sum\limits_{j=1}^i \sum\limits_{k=1}^j 1 = \dots$

  • A
    $\frac{n(n+1)(2n+1)}{6}$
  • B
    $\frac{n(n+1)}{2}$
  • C
    $\left( \frac{n(n+1)}{2} \right)^2$
  • D
    $\frac{n(n+1)(n+2)}{6}$

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