1. The problem statement, all variables and given/known data z^-n(e^z-1)^-1 , z not equal to zero locate the singularities and evaluate the residue. 2. Relevant equations 3. The attempt at a solution i don't have an idea about when z is not equal to zero because i think that only singularity point is z=0 hence if there is a special case, i dont have an idea, could you inform me. ? thanks.