1. The problem statement, all variables and given/known data I want to find the limit of ƩK(n+m,n)zn K(a,b) being the binomial coefficient. 2. Relevant equations Cauchy root test? 3. The attempt at a solution Trying the cauchy root test I get: 1/R = limn->∞[(K(n+m,n))½] But what do I do from here?