Two series
Posted: Fri Sep 21, 2012 1:56 pm
Hello:
I have these two series which I can't handle:
\sum_{k=0}^\inf \frac{k^2}{k!} which according to the GRE exam is 2e. I can't see why.
The other one is:
\sum_{k=0}^\inf \frac{k}{4^(k+1)}. what is its value?
Could someone help me out?
Thanks in advance.
I have these two series which I can't handle:
\sum_{k=0}^\inf \frac{k^2}{k!} which according to the GRE exam is 2e. I can't see why.
The other one is:
\sum_{k=0}^\inf \frac{k}{4^(k+1)}. what is its value?
Could someone help me out?
Thanks in advance.