In the expansion of $(1+x)^n$,the sum $\frac{C_1}{C_0} + 2 \frac{C_2}{C_1} + 3 \frac{C_3}{C_2} + \ldots + n \frac{C_n}{C_{n-1}}$ is equal to:
- A$\frac{n(n+1)}{2}$
- B$\frac{n}{2}$
- C$\frac{n+1}{2}$
- D$n(n+1)$
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Similar Questions
Match the expressions in List-$I$ with their values in List-$II$ for the expansion $(1+x+x^2)^n = a_0 + a_1 x + a_2 x^2 + \ldots + a_{2n} x^{2n}$.
List-$I$ List-$II$ $(A)$ $a_0 + a_2 + \ldots + a_{2n}$ $(I)$ $n \cdot 3^{n-1}$ $(B)$ $a_1 + a_3 + \ldots + a_{2n-1}$ $(II)$ $n \cdot 3^n$ $(C)$ $a_1 + 2a_2 + 3a_3 + \ldots + 2n a_{2n}$ $(III)$ $\frac{1}{2}(3^n + 1)$ $(IV)$ $\frac{1}{2}(3^n - 1)$
The correct match is:
| List-$I$ | List-$II$ |
| $(A)$ $a_0 + a_2 + \ldots + a_{2n}$ | $(I)$ $n \cdot 3^{n-1}$ |
| $(B)$ $a_1 + a_3 + \ldots + a_{2n-1}$ | $(II)$ $n \cdot 3^n$ |
| $(C)$ $a_1 + 2a_2 + 3a_3 + \ldots + 2n a_{2n}$ | $(III)$ $\frac{1}{2}(3^n + 1)$ |
| $(IV)$ $\frac{1}{2}(3^n - 1)$ |
The correct match is:
The sum of the series $1 + \frac{1}{2} {}^{n}C_{1} + \frac{1}{3} {}^{n}C_{2} + \dots + \frac{1}{n+1} {}^{n}C_{n}$ is equal to
DifficultWBJEE 2012
View SolutionIf ${}^n C_0, {}^n C_1, {}^n C_2, \ldots, {}^n C_n$ are the binomial coefficients in the expansion of $(1+x)^n$,then for $n=10$,the value of $\sum_{r=1}^{10} {}^n C_r \cdot r(r-4)$ is:
DifficultTS EAMCET 2020
View Solution$A$ binary sequence is an array of $0$'s and $1$'s. The number of $n$-digit binary sequences which contain an even number of $0$'s is
If $p$ and $q$ are positive integers,then the coefficients of $x^p$ and $x^q$ in the expansion of $(1 + x)^{p + q}$ are
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