Question

If N = {positive integers} and subset C = {positive odd integers), what is C′?

{2, 4, 6, 8, …}

{ }

{0, 1, 2, 3, 4, …}

{1, 3, 5, 7, …}

Answer 1

Last one?

Answer 2

A subset is by definition a group that carries some elements of a larger set. So we need to fulfill the larger condition "positive integers" and the fulfill the condition "odd numnbers". So far as I can tell, the last one fulfills this requirement.