निम्नलिखित श्रेणी $\frac{C_0}{2} - \frac{C_1}{3} + \frac{C_2}{4} - \frac{C_3}{5} + \dots$ के $(n + 1)$ पदों का योग क्या है?

  • A
    $\frac{1}{n + 1}$
  • B
    $\frac{1}{n + 2}$
  • C
    $\frac{1}{n(n + 1)}$
  • D
    $\frac{1}{(n + 1)(n + 2)}$

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योगफल ज्ञात कीजिए: $\left( \binom{21}{1} - \binom{10}{1} \right) + \left( \binom{21}{2} - \binom{10}{2} \right) + \left( \binom{21}{3} - \binom{10}{3} \right) + \dots + \left( \binom{21}{10} - \binom{10}{10} \right) = $

$\sum\limits_{k = 0}^{10} {^{20}{C_k} = }$

यदि $(1 - x + x^2)^n = a_0 + a_1x + a_2x^2 + .... + a_{2n}x^{2n}$ है,तो $a_0 + a_2 + a_4 + .... + a_{2n} = $

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यदि $(1+x)^n$ के विस्तार में $C_0, C_1, C_2, \ldots, C_n$ द्विपद गुणांक हैं,तो $n=5$ होने पर $\sum_{r=0}^{n} r^3 \cdot C_r$ का मान क्या होगा?

$\sum_{r=1}^{15} r^2 \left( \frac{{}^{15}C_r}{{}^{15}C_{r-1}} \right) = $

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