ધારો કે $n \in N$ માટે $a_{n} = \int_{-1}^{n} \left(1 + \frac{x}{2} + \frac{x^{2}}{3} + \ldots + \frac{x^{n-1}}{n}\right) dx$ છે. તો ગણ $\{n \in N : a_{n} \in (2, 30)\}$ ના તમામ ઘટકોનો સરવાળો $...........$ છે.

  • A
    $8$
  • B
    $10$
  • C
    $5$
  • D
    $0$

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