શ્રેણીનો સરવાળો શોધો: $\frac{1}{1 \times 2} + \frac{1}{2 \times 3} + \frac{1}{3 \times 4} + \dots + \frac{1}{n(n + 1)}$

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

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$\sum_{k=1}^{13} \frac{1}{\sin \left(\frac{\pi}{4}+\frac{(k-1) \pi}{6}\right) \sin \left(\frac{\pi}{4}+\frac{k \pi}{6}\right)}$ નું મૂલ્ય શોધો.

વિધાન $(A)$: $1+(1+2+4)+(4+6+9)+(9+12+16)+\ldots+(81+90+100)=1000$
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શ્રેણી $(1^2 + 1) \cdot 1! + (2^2 + 1) \cdot 2! + (3^2 + 1) \cdot 3! + \dots + (n^2 + 1) \cdot n!$ નો સરવાળો શું થાય?

$\prod\limits_{n = 1}^{10} {\left( {\frac{{6\sum\limits_{i = 0}^n i + 1}}{{6\sum\limits_{j = 0}^n {(j - 1)} + 1}}} \right)} $ ની કિંમત શોધો.

શ્રેણી $1 \times 2 \times 3 + 2 \times 3 \times 4 + 3 \times 4 \times 5 + \ldots$ ના $n$ પદોનો સરવાળો શોધો.

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