यदि $n$,$1$ से बड़ा एक धनात्मक पूर्णांक है,तो $3({ }^n C_0) - 8({ }^n C_1) + 13({ }^n C_2) - 18({ }^n C_3) + \ldots$ $(n+1)$ पदों तक $=$

  • A
    -$5$
  • B
    $\frac{2^{n+1}-1}{n}$
  • C
    $\frac{2^n-1}{2}$
  • D
    $0$

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यदि $n \in N$ के लिए $(1+x)^n = C_0 + C_1 x + C_2 x^2 + \ldots + C_n x^n$ है,तो $C_0 + \frac{C_1}{2} + \frac{C_2}{3} + \ldots + \frac{C_n}{n+1} =$

$\binom{50}{4} + \sum_{i=1}^{6} \binom{56-i}{3} = \dots$

$\binom{10}{1} + \binom{10}{2} + \binom{11}{3} + \binom{12}{4} + \binom{13}{5} = \dots$

$\binom{47}{4} + \sum_{r=1}^5 \binom{52-r}{3} = \dots$

योगफल ${C_1} + 2{C_2} + 3{C_3} + 4{C_4} + .... + n{C_n}$ का मान किसके बराबर है?

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