Problem: how many odd factors does 250 have ?
Rationale: "start with the prime factorization : 250 = 2 * 5 * 7 for odd factors , we put aside the factor of two , and look at the other prime factors . set of exponents = { 1 , 1 } plus 1 to each = { 2 , 2 } product = 2 * 2 = 4 therefore , there are 4 odd factors of 250 . answer : b ."
annotated_formula: add(add(add(const_4, const_2), const_1), const_1)