$\sum_{k=0}^{20} \left({}^{20}C_{k}\right)^{2}$ का मान क्या है?

  • A
    ${}^{40}C_{21}$
  • B
    ${}^{40}C_{19}$
  • C
    ${}^{40}C_{20}$
  • D
    ${}^{41}C_{20}$

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यदि $^nC_r = C_r$ और $2 \frac{C_1}{C_0} + 4 \frac{C_2}{C_1} + 6 \frac{C_3}{C_2} + \dots + 2n \frac{C_n}{C_{n-1}} = 650$ है,तो $^nC_2 =$

यदि $P_{n}$,$(1+x)^{n}$ के विस्तार में द्विपद गुणांकों का गुणनफल दर्शाता है,तो $\frac{P_{n+1}}{P_n}=$

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$3 \cdot C_0 + 7 \cdot C_1 + 11 \cdot C_2 + \ldots + (3 + 4n) C_n =$

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

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