∑ { 2r } =? {1-r 2 +r 4 } Note: the sigma Sign is both for numerator and Denominator.

∑ {   2r    } =?
Note: the sigma Sign is  both for numerator and Denominator.


1 Answers

Abhishek Singh
105 Points
7 years ago
hey its easy
factorise the denominator as (r2-r+1)(r2+r+1). now see the diff. of these terms is 2r so you can split the summation.and solve it

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