Q. If $C_{r} =^{n} C_{r}$ , then the value of $2 (\frac{C _{1}}{C _{0}} + 2 \frac{C _{2}}{C _{1}} + 3 \frac{C _{3}}{C _{2}} + .... n \frac{C _{n}}{C _{n - 1}})$

2208 240 Binomial Theorem Report Error

A

n(n - 1)

18%

B

n(n + 1)

64%

C

$n^{2} - 1$

18%

D

$n^{2} + 1$

0%

Solution:

Correct answer is (b) n(n + 1)