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

  • A
    $\frac{1}{n(n + 1)}$
  • B
    $\frac{1}{n + 1}$
  • C
    $\frac{n}{n + 1}$
  • D
    $\frac{n+1}{n}$

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શ્રેણી $\frac{3}{1^2} + \frac{5}{1^2 + 2^2} + \frac{7}{1^2 + 2^2 + 3^2} + \dots$ ના $50$ પદોનો સરવાળો કેટલો થાય?

જો ${a_k} = \frac{1}{{k(k + 1)}}$ હોય,જ્યાં $k = 1, 2, 3, 4, ..., n$,તો ${\left( {\sum\limits_{k = 1}^n {{a_k}} } \right)^2} = $

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

$1(1!) + 2(2!) + 3(3!) + \dots + n(n!) = \dots$

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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?

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