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Im stuck on this question,do i replace 2n by 2n+1

Quote: Originally Posted by asingh88 Im stuck on this question,do i replace 2n by 2n+1 It's hard to understand what' written there , but if it is what I think then that seriers converges absolutely: $\displaystyle \sum^\infty_{n=0}\frac{\cos 2n}{2^n-5}$ , since $\displaystyle \left|\frac{\cos 2n}{2^n-5}\right|\leq\frac{1}{2^n-5}$ ... Tonio