They all had made up their mind. You don’t need to know the others decision to answer No to the question, but you do to say yes. If the first didn’t want a beer they could definitively answer no. They did, but didn’t know the others decisions so couldn’t say yes. Same with the 2nd. The third could say yes because he knew the other two didn’t say no, so whatever they wanted was the answer

This made me go and check to see if bash.org is still going. It is.