1. The problem statement, all variables and given/known data Series k=1 to k=Infinity of: k^2/k! a) e b) 2e c) (1+e)(e-1) d) e^2 e) Infinity 2. Relevant equations e^x = Series from n=1 to n=Infinity of: x^n / n! 3. The attempt at a solution I was guessing this would end up being C but the answer is infact B. As far as I can tell 2e is equal to Series 2^k / k!, I'm unsure how this is equal.