श्रेणी $\frac{1}{2} + \frac{3}{4} + \frac{7}{8} + \frac{15}{16} + \dots$ के प्रथम $n$ पदों का योग क्या है?

  • A
    $2^n - n - 1$
  • B
    $1 - 2^{-n}$
  • C
    $n + 2^{-n} - 1$
  • D
    $2^n - 1$

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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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श्रेणी $5^{2} + 6^{2} + 7^{2} + \ldots + 20^{2}$ का योग ज्ञात कीजिए।

यदि $\frac{1}{1^4}+\frac{1}{2^4}+\frac{1}{3^4}+\ldots \infty = \frac{\pi^4}{90}$,$\frac{1}{1^4}+\frac{1}{3^4}+\frac{1}{5^4}+\ldots \infty = \alpha$,और $\frac{1}{2^4}+\frac{1}{4^4}+\frac{1}{6^4}+\ldots \infty = \beta$,तो $\frac{\alpha}{\beta}$ का मान ज्ञात कीजिए।

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

श्रेणी $1 \times 2 \times 3 + 2 \times 3 \times 4 + 3 \times 4 \times 5 + \dots$ के $n$ पदों का योगफल क्या है?

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