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જો $S_n = 1^3 + 2^3 + \ldots + n^3$ અને $T_n = 1 + 2 + \ldots + n$ હોય,તો

શ્રેઢી $\frac{1^3}{1} + \frac{1^3 + 2^3}{1 + 3} + \frac{1^3 + 2^3 + 3^3}{1 + 3 + 5} + \dots$ ના પ્રથમ $16$ પદોનો સરવાળો કેટલો થાય?

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$1 + 3 + 7 + 15 + 31 + \dots$ શ્રેણીનો $n$ પદ સુધીનો સરવાળો શોધો.

Difficult
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સરવાળો $\sum_{k=1}^{20}(1+2+3+\ldots+k)$ શું થાય?

સાબિત કરો કે $\frac{1 \times 2^{2}+2 \times 3^{2}+\ldots+n \times(n+1)^{2}}{1^{2} \times 2+2^{2} \times 3+\ldots+n^{2} \times(n+1)}=\frac{3 n+5}{3 n+1}$

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