ગણ $\{1, 2, 3, \ldots, 100\}$ માં ધન પૂર્ણાંકો $n$ ની સંખ્યા કેટલી છે જેના માટે $\frac{1^2+2^2+3^2+\ldots+n^2}{1+2+3+\ldots+n}$ એક પૂર્ણાંક થાય?

  • A
    $33$
  • B
    $34$
  • C
    $50$
  • D
    $100$

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$\sum_{k=1}^{2n+1} (-1)^{k-1} \cdot k^2$ ની કિંમત શોધો.

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