श्रेणी $3 \times 8 + 6 \times 11 + 9 \times 14 + \dots$ के $n$ पदों का योग ज्ञात कीजिए।

  • A
    $n(n+1)(3n+5)$
  • B
    $n(n+1)(3n+7)$
  • C
    $3n(n+1)(n+3)$
  • D
    $n(n+1)(n+3)$

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