સરવાળો $1 \times 1! + 2 \times 2! + \ldots + 50 \times 50!$ બરાબર શું થાય?

  • A
    $51!$
  • B
    $51! - 1$
  • C
    $51! + 1$
  • D
    $2 \times 51!$

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શ્રેણી $1 \times 2 \times 3 + 2 \times 3 \times 4 + 3 \times 4 \times 5 + \ldots$ ના $n$ પદોનો સરવાળો શોધો.

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