How many different positive integers are factors of 64 ? Choose the correct answer.
A) 10
B) 12
C) 14
D) 16
E) 18
8×8=4^2 × 2^2   So total factors = (3+1)(3+1) = 16   Answer: 16
<result>D</result>
How many different positive integers are factors of 64 ?