Question

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

{3, 6, 9, 12, 15, 18, 24, 30}

{6, 12, 18, 24, 30}

{6, 12, 18}

{ }

Answer 1

C = {6, 12, 18, 24, 30}
D = {3, 6, 9, 12, 15, 18}

C∩D = {6, 12, 18}