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```        If (1+x+x2)6n=a0+a1x+....then
(a0+a3+a6+.....)=
(a)36n-1
(B)36n+1
(c)36n-1
(D)36n+1-1```
8 years ago

8 Points
```										HI VAIBHAV,
You can do this problem using a short trick,which is used generally to solve objective problems involving n,this will save ur time and u'll get the correct answer.Do onething put n=1/3,so expression becomes (1+x+x2)2 =1+2x+3x2 +2x3+x4 now a0+a3=1+2=3...........now solve all the answers for n=1/3 u'll find that option (a)36n-1=3 is the correct answer.
```
8 years ago
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