$\lim _{n \rightarrow \infty} \left( \sum_{k=1}^n \frac{k^3+6 k^2+11 k+5}{(k+3)!} \right)$ નું મૂલ્ય શું છે?

  • A
    $\frac{4}{3}$
  • B
    $2$
  • C
    $\frac{7}{3}$
  • D
    $\frac{5}{3}$

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$1 \cdot 2 \cdot 3 + 2 \cdot 3 \cdot 4 + 3 \cdot 4 \cdot 5 + \dots$ શ્રેણીના $n$ પદોનો સરવાળો કેટલો થાય?

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.

$\sum\limits_{r = 1}^\infty {{{\tan }^{ - 1}}\left( {\frac{3}{{{r^2} - r + 9}}} \right)} $ ની કિંમત શોધો.

$\frac{1}{1 \times 2} + \frac{1}{2 \times 3} + \frac{1}{3 \times 4} + \dots + \frac{1}{n(n + 1)} = \dots$

જો ${a_1}, {a_2}, \dots, {a_{n+1}}$ એ $A.P.$ માં હોય,તો $\frac{1}{{{a_1}{a_2}}} + \frac{1}{{{a_2}{a_3}}} + \dots + \frac{1}{{{a_n}{a_{n+1}}}}$ ની કિંમત શું થાય?

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