If W = {positive integers} and subset Z = {positive integers divisible by 5}, what is Z′?

{1, 2, 3, 4, …}

{ }

{5, 10, 15, 20, …}

{1, 2, 3, 4, 6, 7, 8, 9, 11, 12, 13, 14, 16, …}

Question

If W = {positive integers} and subset Z = {positive integers divisible by 5}, what is Z′?

 {1, 2, 3, 4, …}

 { }

 {5, 10, 15, 20, …}

 {1, 2, 3, 4, 6, 7, 8, 9, 11, 12, 13, 14, 16, …}

mertsj · Answer

What does subset mean?

anonymous · Answer

i really dont know

mertsj · Answer

It means that everything in the subset is also in the original set.  So if the set is {a,b,c,d,e} one of the subsets is {b,e}

anonymous · Answer

The answer is c

mertsj · Answer

Very good!!

jim_thompson5910 · Answer

Well Z = {5, 10, 15, 20, …}, which is choice C

but that's not what Z' is

mertsj · Answer

Oh good find @jim_thompson5910 .  I didn't see that little ' 
That means everything that is in the original set but is NOT in the subset.  So that would be the last one, @kcute_face_bhunnie-_-

jim_thompson5910 · Answer

Yeah I miss it all the time too..wish it was bigger and more noticeable.