$\sum\limits_{n = 1}^\infty {\left( {{{\tan }^{ - 1}}\left( {\frac{n}{{n + 2}}} \right) - {{\tan }^{ - 1}}\left( {\frac{{n - 1}}{{n + 1}}} \right)} \right)} $ ની કિંમત શોધો.

  • A
    $\frac{\pi }{4}$
  • B
    $\frac{\pi }{3}$
  • C
    $\frac{\pi }{2}$
  • D
    $\frac{3\pi }{4}$

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શ્રેણીનો સરવાળો શોધો: $1 \cdot 1! + 2 \cdot 2! + 3 \cdot 3! + \dots + n \cdot n!$

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જો $\frac{1}{2 \times 4} + \frac{1}{4 \times 6} + \frac{1}{6 \times 8} + \dots (n \text{ પદો}) = \frac{k n}{4(n + 1)}$ હોય,તો $k$ ની કિંમત શોધો.

સરવાળો $1 \times 1! + 2 \times 2! + \ldots + 50 \times 50!$ બરાબર શું થાય?

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

જો $\frac{1}{1 \cdot 5}+\frac{1}{5 \cdot 9}+\frac{1}{9 \cdot 13}+\ldots$ ના $n$ પદોનો સરવાળો $= \frac{27}{109}$ હોય,તો $n = $

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