જો $(1 + x)^n = C_0 + C_1x + C_2x^2 + .......... + C_nx^n$ હોય,તો $\frac{C_1}{C_0} + \frac{2C_2}{C_1} + \frac{3C_3}{C_2} + .... + \frac{nC_n}{C_{n - 1}} = $

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

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Similar Questions

જો $(1 + x + x^2)^n = a_0 + a_1x + a_2x^2 + \dots + a_{2n}x^{2n}$ હોય,તો $a_0 + a_3 + a_6 + \dots =$

ધારો કે $\alpha = \sum_{k=0}^n \left( \frac{({ }^n C_k)^2}{k+1} \right)$ અને $\beta = \sum_{k=0}^{n-1} \left( \frac{{ }^n C_k \cdot { }^n C_{k+1}}{k+2} \right)$. જો $5 \alpha = 6 \beta$ હોય,તો $n$ ની કિંમત શોધો:

જો ${C_r}$ એ $^n{C_r}$ માટે વપરાતું હોય,તો શ્રેણી $\frac{{2(n/2)!(n/2)!}}{{n!}}[C_0^2 - 2C_1^2 + 3C_2^2 - ..... + {( - 1)^n}(n + 1)C_n^2]$ નો સરવાળો,જ્યાં $n$ એ યુગ્મ ધન પૂર્ણાંક છે,તે શું થાય?

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

જો $\sum\limits_{K = 1}^{12} {12K \cdot {^{12}C_K} \cdot {^{11}C_{K - 1}}} $ એ $\frac{{12 \times 21 \times 19 \times 17 \times \dots \times 3}}{{11!}} \times {2^{12}} \times p$ બરાબર હોય,તો $p$ ની કિંમત શોધો.

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