What am I doing wrong?

*To*: mathgroup at smc.vnet.net*Subject*: [mg91581] What am I doing wrong?*From*: Jack L Goldberg 1 <jackgold at umich.edu>*Date*: Thu, 28 Aug 2008 03:17:08 -0400 (EDT)

In(1) SeriesCoefficient[1/(1-x),{x,0,n}] Out(1) (-1)^n*Binomial[-1,n] Next, In(2) FunctionExpand[(-1)^n*Binomial[-1,n],Assumptions->Element[n,Integers]] OUt(2) ComplexInfinity In(3) Table[(-1)^n*Binomial[-1,n], {n,-2,2}] Out(3) {0,0,1,1,1} Incidentally, FullSimplify in place of FunctionExpand yields the same result, ComplexInfinity. I wonder if this misleading answer is a result of FunctionExpand and FullSymplify resorting to the Gamma Function for the simplification? Is this a bug or a feature? Thanks, Jack