[SOLVED] Giving a Recursive Formula 1. The problem statement, all variables and given/known data Give a recursive definition of a) the set of odd positive integers. b) the set of positive integer powers of 3. c) the set of polynomials with integer coefficients. I've solved a). Having trouble with b). Unsure what c) is asking. For a), got: f(0) = 1, and f(n) = f(n – 1) + 2.