સરવાળો $\sum\limits_{r = 1}^{10} {({r^2} + 1) \times r!}$ કોના બરાબર છે?

  • A
    $11 \times (11!)$
  • B
    $10 \times (11!)$
  • C
    $(11!)$
  • D
    $101 \times (10!)$

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અનંત શ્રેણી $\cot ^{-1}\left(\frac{7}{4}\right)+\cot ^{-1}\left(\frac{19}{4}\right)+\cot ^{-1}\left(\frac{39}{4}\right)+\cot ^{-1}\left(\frac{67}{4}\right)+\ldots \ldots$ નો સરવાળો :-

$\prod\limits_{n = 1}^{10} {\left( {\frac{{6\sum\limits_{i = 0}^n i + 1}}{{6\sum\limits_{j = 0}^n {(j - 1)} + 1}}} \right)} $ ની કિંમત શોધો.

$\sum\limits_{n = 2}^\infty {\frac{n}{{1 + {n^2}\left( {{n^2} - 2} \right)}}} $ ની કિંમત શોધો.

$\sum\limits_{r = 0}^{100} {(r^2 + 4r + 4)(r + 1)!}$ ની કિંમત :-

જો $\frac{1}{2 \times 4} + \frac{1}{4 \times 6} + \frac{1}{6 \times 8} + \dots (n \text{ પદો}) = \frac{k n}{n+1}$ હોય,તો $k$ ની કિંમત શોધો.

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