$\sum\limits_{r = 0}^m {^{n + r}{C_n} = } $

  • A
    $^{n + m + 1}{C_{n + 1}}$
  • B
    $^{n + m + 2}{C_n}$
  • C
    $^{n + m + 3}{C_{n - 1}}$
  • D
    इनमें से कोई नहीं

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$\frac{C_1}{2} + \frac{C_3}{4} + \frac{C_5}{6} + \dots$ का मान किसके बराबर है?

Difficult
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यदि $C_r = ^{100}C_r$ है,तो $1 \cdot C_0^2 - 2 \cdot C_1^2 + 3 \cdot C_2^2 - 4 \cdot C_3^2 + \dots + 101 \cdot C_{100}^2$ का मान ज्ञात कीजिए।

यदि $(1+x)^n = a_0 + a_1 x + a_2 x^2 + \ldots + a_n x^n$ और $a_0 - a_2 + a_4 - a_6 + \ldots = k \cos \frac{n \pi}{4}$ है,तो $k = $

$\sum_{r=0}^{6} \left({}^{6}C_{r} \cdot {}^{6}C_{6-r}\right)$ का मान किसके बराबर है?

यदि $\binom{10}{2} + \binom{10}{3} + \binom{11}{4} + \binom{12}{5} + \binom{13}{6} = \binom{14}{r}$ है,तो $r = \dots$

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