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a0+a3+a6+a9+......=3^n-1if(1+x+x^2)=a0+a1x+a2x^2+.......+a2nx^2n

a0+a3+a6+a9+......=3^n-1if(1+x+x^2)=a0+a1x+a2x^2+.......+a2nx^2n

Grade:11

1 Answers

Deepak Kumar Shringi
askIITians Faculty 4404 Points
6 years ago
first put x=1
then put x=-1 and to find a0put x=0 now add equation i & ii to get answer

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