$\frac{1}{3 \cdot 6} + \frac{1}{6 \cdot 9} + \frac{1}{9 \cdot 12} + \dots$ $9$ પદો સુધી $=$

  • A
    $\frac{10}{99}$
  • B
    $\frac{11}{108}$
  • C
    $\frac{1}{10}$
  • D
    $\frac{1}{90}$

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Similar Questions

પદાવલિ $3(1!) - 4(2!) + 5(3!) - 6(4!) + \dots - 2008(2006)! + (2007)!$ નું મૂલ્ય શોધો.

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

સીમાનું મૂલ્ય શોધો: $\lim _{n \rightarrow \infty} \sum_{r=1}^n \tan ^{-1}\left(\frac{2 r}{r^4+r^2+2}\right)$

જો $S_n = \frac{n(n + 1)(n + 2)}{6}$ હોય,તો $\sum_{n = 1}^\infty \frac{1}{t_n} = $

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