$\sum\limits_{r = 1}^\infty {{{\tan }^{ - 1}}\left( {\frac{3}{{{r^2} - r + 9}}} \right)} $ का मान ज्ञात कीजिए।

  • A
    $\frac{\pi }{3}$
  • B
    $\frac{\pi }{6}$
  • C
    $\frac{\pi }{2}$
  • D
    $\frac{\pi }{12}$

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किसी भी $n \in N$ के लिए,$\frac{1}{2 \cdot 5} + \frac{1}{5 \cdot 8} + \ldots + \frac{1}{(3n-1)(3n+2)} = $

श्रेणी $\frac{1}{2 \cdot 5} + \frac{1}{5 \cdot 8} + \frac{1}{8 \cdot 11} + \dots$ के $n$ पदों का योगफल क्या है?

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