योगफल $\sum\limits_{i = 0}^m {\binom{10}{i}} {\binom{20}{m - i}}$,(जहाँ $\binom{p}{q} = 0$ यदि $p < q$),तब अधिकतम होता है जब $m$ है

  • A
    $5$
  • B
    $15$
  • C
    $10$
  • D
    $20$

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$\sum_{r=0}^{6} \left({}^{6}C_{r} \cdot {}^{6}C_{6-r}\right)$ का मान किसके बराबर है?

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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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