Hey,
which outta the 3 is correct?
Don't you think?
OR
Don't you think so?
OR
Don't you think that so?
"Don't you think so?" is correct.
For exmaple: It's very strange. Don't you think so?
What is outta, Prattsishunk? I suppose you mean which of the three is correct?
The third one is wrong. The other two are fine, I think.
Not a teacher