The numbers in which of the following pairs do NOT have a pair of distinct prime divisors in common ?
Choose one:
A) 10 and 20  B) 12 and 18  C) 24 and 32  D) 21 and 63  E) 22 and 88
32 has only one prime 2 (32=2^5) in its prime factorization, so it can not have a PAIR of distinct prime divisors in common with ANY of the numbers.   Answer: 24 and 32.
<result>C</result>
The numbers in which of the following pairs do NOT have a pair of distinct prime divisors in common ?