${ }^{34}C_{10} + 3 \cdot { }^{34}C_{9} + 3 \cdot { }^{34}C_{8} + { }^{34}C_{7} = $

  • A
    ${ }^{39}C_{10}$
  • B
    ${ }^{36}C_{10}$
  • C
    ${ }^{37}C_{10}$
  • D
    ${ }^{35}C_{10}$

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જો $C_r = ^{100}C_r$ હોય,તો $1 \cdot C_0^2 - 2 \cdot C_1^2 + 3 \cdot C_2^2 - 4 \cdot C_3^2 + \dots + 101 \cdot C_{100}^2$ ની કિંમત શોધો.

ધારો કે $Q(x)$ એ $n$ ઘાતવાળી બહુપદી છે. જો $Q(1)=1$ અને $\frac{Q(2x)}{Q(x+1)}+\frac{56}{x+7}-8=0$ હોય,તો ${}^nC_0+{}^nC_1+\ldots+{}^nC_n$ ની કિંમત કેટલી થાય?

જો ${S_n} = \sum\limits_{r = 0}^n {\frac{1}{{^n{C_r}}}} $ અને ${t_n} = \sum\limits_{r = 0}^n {\frac{r}{{^n{C_r}}}} $ હોય,તો $\frac{{{t_n}}}{{{S_n}}}$ ની કિંમત શું થાય?

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