$\left[\frac{12}{(\sqrt{5}+\sqrt{3})}+\frac{18}{(\sqrt{5}-\sqrt{3})}\right]$ ની કિંમત શું છે?

  • A
    $15(5 \sqrt{2}-\sqrt{3})$
  • B
    $3(5 \sqrt{5}+\sqrt{3})$
  • C
    $15(\sqrt{5}+\sqrt{3})$
  • D
    $3(3 \sqrt{5}+\sqrt{3})$

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$\frac{1}{1 \times 2} + \frac{1}{2 \times 3} + \frac{1}{3 \times 4} + \ldots + \frac{1}{9 \times 10}$ ની કિંમત શોધો.

જો $x = \frac{a}{a-1}$ અને $y = \frac{1}{a-1}$ હોય,તો

નીચેના સમીકરણમાં પ્રશ્નાર્થ ચિહ્ન $(?)$ ની જગ્યાએ શું આવવું જોઈએ?
$30.01^{2} - 19.98^{2} - ? = 21.81^{2}$

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