Hello,

I was looking at your example for making the power set of {red,green}. I added the following code so potential students could see the correct answer :

BEGIN_PGML_SOLUTION

The answer is [$ans].

END_PGML_SOLUTION

However, the solution displayed is

*( Instructor solution preview: show the student solution after due date. )*

The answer is {{}, {0}, {1}, {0,1}}.

Can you let me know why the answer is displayed incorrectly? Thank-you!

Cindy