FRIDAY PUZZLE

The prince of a magical kingdom has been set a challenge by his Father.

He must carry three egg sized diamonds from the Royal palace to his Father's castle 2 miles away. The king has given him strict instructions that he must keep the diamonds in his possession at all times and not let them out of his sight.

Half way through the journey the Prince has to cross a river bridge that is guarded by a troll. The troll realises how precious the diamonds are and would like to steal them. So the troll tells the Prince he can only physically carry two of the diamonds over over the bridge.

The Prince realises that if he leaves one diamond behind and carries two over and then comes back for the other one - the troll might steal the diamonds.

What should the Prince do?