मान लीजिए $(1+2x)^{20} = a_0 + a_1x + a_2x^2 + \dots + a_{20}x^{20}$ है। तो $3a_0 + 2a_1 + 3a_2 + 2a_3 + 3a_4 + 2a_5 + \dots + 2a_{19} + 3a_{20}$ का मान ज्ञात कीजिए।

  • A
    $\frac{5 \cdot 3^{20}-3}{2}$
  • B
    $\frac{5 \cdot 3^{20}+3}{2}$
  • C
    $\frac{5 \cdot 3^{20}+1}{2}$
  • D
    $\frac{5 \cdot 3^{20}-1}{2}$

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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

यदि $C_r = { }^n C_r$ है,तो $C_0 + C_4 + C_8 + C_{12} + \ldots$ का योग ज्ञात कीजिए।

योगफल ज्ञात कीजिए: $\left( \binom{21}{1} - \binom{10}{1} \right) + \left( \binom{21}{2} - \binom{10}{2} \right) + \left( \binom{21}{3} - \binom{10}{3} \right) + \dots + \left( \binom{21}{10} - \binom{10}{10} \right) = $

$^{15}C_0^2 - ^{15}C_1^2 + ^{15}C_2^2 - ... - ^{15}C_{15}^2$ का मान क्या है?

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

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