1. The problem statement, all variables and given/known data Hi! I need to find ratio (2n+1)!/(2n+3)! for interval of convergence calculation. 2. Relevant equations 5! = 1*2*3*4*5 3. The attempt at a solution i have no idea where to start since i have never dealt with factorials before.. if you just show me some kind off factorial property i can use ill be able to figure it out. wikipedia didnt help.