Question

If S = {positive integers} and subset T = {positive integers divisible by 3}, what is T′?

{3, 6, 9, 12, …}

{1, 2, 3, 4, 5, …}

{1, 2, 4, 5, 7, 8, …}

{ }

Answer 1

{1,2,4,5,7,8,...}