यदि ${S_n} = \sum\limits_{k = 1}^n {{a_k}} $ और $\mathop {\lim }\limits_{n \to \infty } {a_n} = a,$ है,तो $\mathop {\lim }\limits_{n \to \infty } \frac{{{S_{n + 1}} - {S_n}}}{{\sqrt {\sum\limits_{k = 1}^n k } }}$ का मान ज्ञात कीजिए।

  • A
    $0$
  • B
    $a$
  • C
    $\sqrt{2} a$
  • D
    $2a$

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