He gave his mother the wrong answer at the table.
More likely to come up with a wrong answer than a right one, and, either way, he couldn't be certain.
The game will go on until a wrong answer is given.
After a wrong answer the other team can take a guess.
"And how much is he getting for each wrong answer?"
It was the wrong answer, and now he knew the right one.
But it will give you the wrong answer once other forces come into effect.
There would be, he knew, no clear right or wrong answer.
In the second round, the players will now have to guess who gave a wrong answer among the three.
A wrong answer along the way simply ended the game.