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```				   If (1+x)n=C0+C1x+C2x2....+Cnxn,then
C0+3C1+5C2+...+(2n+1)Cn  is equal to
(a)n*2n
(b)(n+1)2n
(c)n*2n+1
(d)0
```

7 years ago

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### Answers : (2)

```										hi vaibhav,
solve this problem using the same trick,put n=2
(1+x)2  =1+2x+x2  ,so c0=1,c1=2,c2=1
c0+3c1+5c2=12,now solve all the options with n=2 u'll find option(b)(n+1)2n=12 is the right answer.
```
7 years ago
```										hi vaibhav,
in dis problem , u can write d general term of d series dat u hav to find,
Tr = (2r + 1)Cr
now apply summation ,
S =2 *  sum r* Cr + sum Cr
sum Cr can be calculated by putting 1 in place of x in (1+x)^n, dat will give 2^n
for r * Cr , u just differentiate (1+x)^n  and again put 1 in place of x , den u will get n*2^(n-1)=C1+2*C2+.......
d final expression after adding will be n*2^n +2^n = (n+1)2^n
```
7 years ago

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