How do you find the interval of convergence #Sigma 2x^n# from #n=[0,oo)#?
1 Answer
Jan 26, 2018
The radius of convergence is
Explanation:
We will use the ratio test for convergence. We have that:
The ratio test tells us that the sum convergence if:
In our case:
So:
So, by the ratio test, for convergence: