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, ...}
{ }

Okay, so there's this apostrophe by the T... I'm not sure if that's supposed to MEAN something, but the question is almost too easy if the apostrophe doesn't mean something.

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, ...}
 { }

Okay, so there's this apostrophe by the T... I'm not sure if that's supposed to MEAN something, but the question is almost too easy if the apostrophe doesn't mean something.

amistre64 · Answer

T' is the complement of T.  its everything that is not T

the union of of T and T' create S

amistre64 · Answer

so

T = positive integers divisible by 3

T' = positive integers NOT divisible by 3

leahhhmorgannn · Answer

Oh, okay! Thanks, I think I got it now. I was just confused by that.