श्रेणी $5+11+19+29+41+\ldots$ के प्रथम $20$ पदों का योग $..........$ है।

  • A
    $3450$
  • B
    $3250$
  • C
    $3420$
  • D
    $3520$

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$\sum\limits_{i = 1}^n {\sum\limits_{j = 1}^i {\sum\limits_{k = 1}^j 1 } } = \dots$

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$2.5 + 5.9 + 8.13 + 11.17 + \ldots$ $10$ पदों तक $=$

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