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

  • 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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$2.\overline{357} = $

શ્રેણી $\frac{1^3}{1} + \frac{1^3 + 2^3}{1 + 3} + \frac{1^3 + 2^3 + 3^3}{1 + 3 + 5} + \dots$ નું ${n^{th}}$ પદ શું હશે?

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શ્રેણી $\frac{3 \times 1}{1^2} + \frac{5 \times (1^3 + 2^3)}{1^2 + 2^2} + \frac{7 \times (1^3 + 2^3 + 3^3)}{1^2 + 2^2 + 3^2} + \dots$ ના $10$ માં પદ સુધીનો સરવાળો કેટલો થાય?

જો $x_n = \frac{2n^2 + n + 1}{2n^2 - 3n + 2}$ હોય,તો $\sum_{r=1}^n \left[ \left( \prod_{i=1}^r x_i \right) - 2\sum_{i=1}^r (2i - 1) \right]$ ની કિંમત શોધો.

ધારો કે $a_n$ એક શ્રેણી છે જેથી $a_1 = 5$ અને $a_{n+1} = a_n + (n - 2)$ તમામ $n \in N$ માટે,તો $a_{51}$ શું છે?

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