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$\frac{1^3 + 2^3 + 3^3 + 4^3 + \dots + 12^3}{1^2 + 2^2 + 3^2 + 4^2 + \dots + 12^2} = $

શ્રેણી $\frac{1}{1} + \frac{1 + 2}{2} + \frac{1 + 2 + 3}{3} + \dots$ નું $n^{th}$ પદ શું હશે?

શ્રેણી $1 \cdot 2015 + 2 \cdot 2014 + 3 \cdot 2013 + \dots + 2015 \cdot 1$ નો સરવાળો :-

જો $\sum\limits_{r=1}^\infty \frac{1}{(2r-1)^2} = \frac{\pi^2}{8}$ હોય,તો $\sum\limits_{r=1}^\infty \frac{1}{r^2} = \dots$

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ધારો કે $u_n = \frac{1}{\sqrt{5}} \left[ \left( \frac{1 + \sqrt{5}}{2} \right)^n - \left( \frac{1 - \sqrt{5}}{2} \right)^n \right]$,$n = 0, 1, 2, ...$ માટે,તો નીચેનામાંથી કયું સત્ય છે?

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