The numbers in which of the following pairs do NOT have a pair of distinct prime divisors in common?
Choose the correct choice from the following choices: A) 10 and 20 B) 12 and 18 C) 20 and 16 D) 21 and 63 E) 22 and 88
16 has only the prime 2 (16=2^4) in its prime factorization, so it can not have a PAIR of distinct prime divisors in common with ANY of the numbers.   The answer is 20 and 16.
<result>C</result>
The numbers in which of the following pairs do NOT have a pair of distinct prime divisors in common?