A long time ago, there was a king who had the habit of asking questions to his soldiers, once every month. A new soldiers joins the army. For precautions, he asks the soldier behind him about the kind of questions the king asks.
Old soldier : He'll first ask you what your age is. Say 20. Then he will ask you the number of battles you have fought. Say 4. Then he will ask you whether you have fought the Battle of Troy or the Battle of Plassey. Say both.
The new soldier thanks him. But, at the his time of questioning the king decides to change the sequence.
