$\sum\limits_{k = 0}^{10} {^{20}{C_k} = }$

  • A
    $2^{19} + \frac{1}{2} {^{20}C_{10}}$
  • B
    $2^{19}$
  • C
    $^{20}C_{10}$
  • D
    આમાંથી કોઈ નહીં

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$C_0 C_r + C_1 C_{r+1} + C_2 C_{r+2} + \dots + C_{n-r} C_n =$

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જો $n$ એ $1$ કરતા મોટો પૂર્ણાંક હોય,તો $a - ^nC_1(a - 1) + ^nC_2(a - 2) + \dots + (-1)^n(a - n) = $

જો $\sum\limits_{i = 0}^4 {^{4 + i}} {C_i} + \sum\limits_{j = 6}^9 {^{3 + j}} {C_j} = {\,^x}{C_y}$ ($x$ એ અવિભાજ્ય સંખ્યા છે),તો નીચેનામાંથી કયું ખોટું છે?

જો $(1 + x)^{15} = C_0 + C_1x + C_2x^2 + ...... + C_{15}x^{15}$ હોય,તો $C_2 + 2C_3 + 3C_4 + .... + 14C_{15} = $

જો $^nC_r = C_r$ અને $2 \frac{C_1}{C_0} + 4 \frac{C_2}{C_1} + 6 \frac{C_3}{C_2} + \dots + 2n \frac{C_n}{C_{n-1}} = 650$ હોય,તો $^nC_2 =$

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