Definition: Two numbers that are relatively prime cannot be divided by the same number (except for 1)
Since, 10 & 24 can both be divided by 2, 18 & 33 can both be divided by 3, & 9 & 21 can both be divided by 3, by process of elimination, the correct answer is:
A) 12 & 35
12 can be divided by 1, 2, 3, 4, 6, & 12
35 can be divided by 1, 5, 7, & 35
the only common term is 1 and no others, so this supports the answer is A)
