Question

If C = {integers divisible by 6 from 1 to 30} and D if c= {integers divisible by 3 from 1 to 20}, what is C ∩ D?

Answer 1

C = {6,12,18,24,30}
D={3,6,9,12,15,18}
the intersection of two sets is a set that contain the common elements in the two sets

C ∩ D={6,12,18}