Question

If C = {integers divisible by 2 from 1 to 12} and D = {integers divisible by 4 from 1 to 16}, what is C ∩ D?

{4, 8, 12}

{2, 4, 6, 8, 10, 12, 16}

{8, 12}

{ }

Answer 1

{4, 8, 12}
C ∩ D means the set that contains the elements C and D have in common
elements of C {2,4,6,8,10,12}
elements of D {4,8,12,16}
so only three numbers are present on both C and D {4, 8, 12}