Which pair of numbers have a greatest common factor of 3? select each correct answer. 6 and 9 ! 18 and 15 ! 15 and 20 ! 3 and 9 !

The pairs would be:
6 and 9
18 and 15
3 and 9

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.