$\frac{1}{3 \cdot 6} + \frac{1}{6 \cdot 9} + \frac{1}{9 \cdot 12} + \dots$ $9$ पदों तक $=$

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

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$\frac{1}{1 \times 5} + \frac{1}{5 \times 9} + \frac{1}{9 \times 13} + \ldots$ $n$ पदों तक $=$

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