$1 + 3 + 7 + 15 + 31 + \dots$ के $n$ पदों तक का योग =

  • A
    ${2^{n + 1}} - n$
  • B
    ${2^{n + 1}} - n - 2$
  • C
    ${2^n} - n - 2$
  • D
    इनमें से कोई नहीं

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$1 + \frac{1^3 + 2^3}{1 + 2} + \frac{1^3 + 2^3 + 3^3}{1 + 2 + 3} + \dots + \frac{1^3 + 2^3 + 3^3 + \dots + 15^3}{1 + 2 + 3 + \dots + 15} - \frac{1}{2}(1 + 2 + 3 + \dots + 15)$ का मान ज्ञात कीजिए।

$11^3 + 12^3 + \dots + 20^3$

सिद्ध कीजिए कि $\frac{1 \times 2^{2}+2 \times 3^{2}+\ldots+n \times(n+1)^{2}}{1^{2} \times 2+2^{2} \times 3+\ldots+n^{2} \times(n+1)}=\frac{3 n+5}{3 n+1}$

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$\sum\limits_{i = 1}^n {\sum\limits_{j = 1}^i {\sum\limits_{k = 1}^j 1 } } = \dots$

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$(0.05)^{\log_{\sqrt{20}}(0.1 + 0.01 + 0.001 + \dots)}$ का मान है

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