Problem: find the number of different prime factors of 25650
Rationale: explanation : l . c . m of 25650 = 2 x 3 x 3 x 3 x 5 x 5 x 19 3 , 2 , 5,19 number of different prime factors is 4 . answer : option a
annotated_formula: add(const_2, const_2)