શ્રેણી $\frac{1}{{1 + {1^2} + {1^4}}} + \frac{2}{{1 + {2^2} + {2^4}}} + \frac{3}{{1 + {3^2} + {3^4}}} + \dots$ ના $n$ પદોનો સરવાળો શોધો.

  • A
    $\frac{{n({n^2} + 1)}}{{{n^2} + n + 1}}$
  • B
    $\frac{{n(n + 1)}}{{2({n^2} + n + 1)}}$
  • C
    $\frac{{n({n^2} - 1)}}{{2({n^2} + n + 1)}}$
  • D
    આમાંથી કોઈ નહીં

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શ્રેણી $\frac{3}{1^2} + \frac{5}{1^2 + 2^2} + \frac{7}{1^2 + 2^2 + 3^2} + \dots$ ના $n$ પદોનો સરવાળો $.........$ છે.

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જો $\left(1+\frac{3}{1}\right)\left(1+\frac{5}{4}\right)\left(1+\frac{7}{9}\right) \ldots \left(1+\frac{2n+1}{n^2}\right) = 121$ હોય,તો $n =$

$\sum_{k=0}^{12} \frac{1}{\sin \left((k+1) \frac{\pi}{6}+\frac{\pi}{4}\right) \sin \left(\frac{k \pi}{6}+\frac{\pi}{4}\right)} = $

$\sum_{n=1}^{10} \left( \frac{528}{n(n+1)(n+2)} \right)$ ની કિંમત શોધો:

$\sum\limits_{r = 0}^{100} {(r^2 + 4r + 4)(r + 1)!}$ ની કિંમત :-

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