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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यदि $(1 - x + x^2)^n = a_0 + a_1x + a_2x^2 + .... + a_{2n}x^{2n}$ है,तो $a_0 + a_2 + a_4 + .... + a_{2n} = $

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यदि $\binom{10}{2} + \binom{10}{3} + \binom{11}{4} + \binom{12}{5} + \binom{13}{6} = \binom{14}{r}$ है,तो $r = \dots$

यदि $\binom{40}{0} + \binom{41}{1} + \binom{42}{2} + \dots + \binom{60}{20} = \frac{m}{n} \binom{60}{20}$,जहाँ $m$ और $n$ सह-अभाज्य हैं,तो $m+n$ का मान ज्ञात कीजिए।

$\frac{{^nC_0}}{1} + \frac{{^nC_2}}{3} + \frac{{^nC_4}}{5} + \frac{{^nC_6}}{7} + \dots = $

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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