$\frac{C_1}{C_0} + 2 \cdot \frac{C_2}{C_1} + 3 \cdot \frac{C_3}{C_2} + \dots + n \cdot \frac{C_n}{C_{n-1}}$ का मान किसके बराबर है?

  • A
    $\frac{n(n - 1)}{2}$
  • B
    $\frac{(n - 1)(n + 1)}{2}$
  • C
    $\frac{n(n + 1)}{2}$
  • D
    $\frac{n^2 + n}{4}$

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$\binom{47}{4} + \sum_{r=1}^5 \binom{52-r}{3} = \dots$

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$^{4n}C_0 + ^{4n}C_4 + ^{4n}C_8 + ... + ^{4n}C_{4n}$ का मान क्या है?

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