$\binom{50}{4} + \sum_{i=1}^{6} \binom{56-i}{3} = \dots$

  • A
    $\binom{55}{4}$
  • B
    $\binom{55}{3}$
  • C
    $\binom{56}{3}$
  • D
    $\binom{56}{4}$

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यदि $n \geq 2$ एक धनात्मक पूर्णांक है,तो श्रेणी ${}^{n+1} C_{2}+2\left({}^{2} C_{2}+{}^{3} C_{2}+{}^{4} C_{2}+\ldots+{}^{n} C_{2}\right)$ का योग ...... है।

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

यदि $(1-x+x^2)^n = a_0 + a_1 x + \ldots + a_{2n} x^{2n}$ है, तो $a_0 + a_2 + a_4 + \ldots + a_{2n}$ का मान ज्ञात कीजिए।

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

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यदि $1^2 \cdot \binom{15}{1} + 2^2 \cdot \binom{15}{2} + 3^2 \cdot \binom{15}{3} + \ldots + 15^2 \cdot \binom{15}{15} = 2^m \cdot 3^n \cdot 5^k$, जहाँ $m, n, k \in N$, तो $m + n + k$ का मान है:

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