How many factors of 220 are odd numbers greater than 1? Choose the correct choice.
A) 3 B) 4 C) 5 D) 6 E) 7

Rationale: when factorized , 220 has 4 prime factors . of these prime factors 2 are odd and 2 are even . hence total number of odd factors is 2 * 2 ( 4 ) , which includes 1 . the total number of odd factors greater than 1 are 3 . ( option a )
Answer: A