Let \( (1+x)^{n}=\sum_{i=0}^{n} C_{r} x^{y} \) \( \frac{C_{1}}{C_{0}}+2 \frac{C_{2}}{C_{1}}+3 \f...
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0Let \( (1+x)^{n}=\sum_{i=0}^{n} C_{r} x^{y} \)
\( \frac{C_{1}}{C_{0}}+2 \frac{C_{2}}{C_{1}}+3 \frac{C_{3}}{C_{2}}+\ldots+n \frac{C_{n}}{C_{n-1}}=\frac{1}{k} n(n+1) \)
(A) \( 1 / 2 \)
(B) 2
(C) \( 1 / 3 \)
(D) 3
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