$n$ पदों तक श्रेणी $1^2 \cdot 2 + 2^2 \cdot 3 + 3^2 \cdot 4 + \dots$ का योग क्या है?

  • A
    $\frac{n^3(n + 1)^3(2n + 1)}{24}$
  • B
    $\frac{n(n + 1)(3n^2 + 7n + 2)}{12}$
  • C
    $\frac{n(n + 1)}{6}[n(n + 1) + (2n + 1)]$
  • D
    $\frac{n(n + 1)}{12}[6n(n + 1) + 2(2n + 1)]$

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