What did asch have his subjects judge?

Answer 1

Often went along with the group and picked the wrong line

Answer 2

Asch gave his subjects 3 test lines and one example line. He asked them to judge which of the test lines was the same length as the example line. He then replaced this with a different set, and the experiment was repeated.

For the participants in a group, they gave their judgement after all but one of the stooges had already answered.