Question

If C = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12} and D = {numbers divisible by 3 from 1 to 12}, what is C n D?
Answer

{3, 6, 9, 12}

{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12}

{ }

{3, 6}

Answer 1

{3, 6, 9, 12}
is the intersection of sets C and D. The intersection contains elements common to both sets C and D.