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

  • A
    $\frac{n(n + 1)(2n + 1)}{6}$
  • B
    $(\frac{n}{2}(n + 1))^2$
  • C
    $\frac{n(n + 1)}{2}$
  • D
    $\frac{n(n + 1)(n + 2)}{6}$

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$\sum_{k=1}^5 \frac{1^3+2^3+\ldots+k^3}{1+3+5+\ldots+(2 k-1)}$ ની કિંમત શોધો. ($.5$ માં)

$\frac{1}{2 \cdot 5} + \frac{1}{5 \cdot 8} + \frac{1}{8 \cdot 11} + \ldots$ $16$ પદો સુધી $=$

શ્રેણી $2^2 + 4^2 + 6^2 + \dots$ ના $n$ પદોનો સરવાળો કેટલો થાય?

$11^2 + 12^2 + 13^2 + \dots + 20^2 = ?$

જો $\sum\limits_{i = 1}^n i = \frac{n(n + 1)}{2}$ હોય,તો $\sum\limits_{i = 1}^n (3i - 2) = $

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