$\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.

  • A
    $331$
  • B
    $111$
  • C
    $131$
  • D
    $311$

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$\text{આપેલ છે કે, } \frac{\sin 1^{\circ}}{\sin x^{\circ} \sin (x+1)^{\circ}} = \cot x^{\circ} - \cot (x+1)^{\circ}, \text{ તો } \frac{1}{\sin 45^{\circ} \sin 46^{\circ}} + \frac{1}{\sin 46^{\circ} \sin 47^{\circ}} + \dots + \frac{1}{\sin 89^{\circ} \sin 90^{\circ}} \text{ ની કિંમત શોધો.}$

જો $n = 1, 2, 3, \dots$ માટે ${t_n} = \frac{1}{4}(n + 2)(n + 3)$ હોય,તો $\frac{1}{t_1} + \frac{1}{t_2} + \frac{1}{t_3} + \dots + \frac{1}{t_{2003}} = $

Difficult
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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.

$\frac{1}{3 \cdot 6} + \frac{1}{6 \cdot 9} + \frac{1}{9 \cdot 12} + \dots$ $9$ પદો સુધી $=$

$\sum_{r=1}^{20} (r^{2}+1)(r!)$ ની કિંમત શોધો:

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