यदि $C_{0} + 5 \cdot C_{1} + 9 \cdot C_{2} + \ldots + (101) \cdot C_{25} = 2^{25} \cdot k$ है,तो $k$ का मान ज्ञात कीजिए:

  • A
    $42$
  • B
    $45$
  • C
    $51$
  • D
    $48$

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यदि $\frac{1}{n+1} {}^{n}C_{n} + \frac{1}{n} {}^{n}C_{n-1} + \dots + \frac{1}{2} {}^{n}C_{1} + {}^{n}C_{0} = \frac{1023}{10}$ है,तो $n$ का मान ज्ञात कीजिए।

यदि $\sum\limits_{K = 1}^{12} {12K \cdot {^{12}C_K} \cdot {^{11}C_{K - 1}}} $ का मान $\frac{{12 \times 21 \times 19 \times 17 \times \dots \times 3}}{{11!}} \times {2^{12}} \times p$ के बराबर है,तो $p$ का मान ज्ञात कीजिए।

मान लीजिए $S_1 = \sum_{j=1}^{10} j(j-1) \binom{10}{j}$,$S_2 = \sum_{j=1}^{10} j \binom{10}{j}$,और $S_3 = \sum_{j=1}^{10} j^2 \binom{10}{j}$.
कथन $(A) : S_3 = 55 \times 2^9$
कारण $(R) : S_1 = 90 \times 2^8$ और $S_2 = 10 \times 2^8$

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

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यदि ${ }^{n} C_0+\frac{1}{2}{ }^{n} C_1+\frac{1}{3}{ }^{n} C_2+\ldots+\frac{1}{n+1}{ }^{n} C_{n}=\frac{1023}{10}$ है,तो $n=$

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