Once upon a time, in a land far away away, their was a merchant and his daughter. The merchant had fallen on hard times and had to borrow a large sum from a moneylender. After a year had passed the merchant was still in debt and had no way of paying the money back. So the moneylender proposed a way to cancel his debt. He suggested that he offer the merchant a bag containing two stones, one black and one white. His daughter must select a stone from the bag, if she chooses the black one the debt is cancelled, if she chooses the white one the debt is cancelled but she must marry the moneyleader. The merchant agrees, however unbeknown to him, the moneyleader places two white stones in the bag. Reaching into the bag the daughter sees the two white stones. She must select a stone, so what can she do to ensure she doesn’t have to marry the moneyleader and get the debt cancelled?



Steve said
If she picks both stones out of the bag, they will see that both stones are white and that the moneylender cheated.
Is that allowed?
Croaky said
A possible solution, and the straightforward one, but can you think of anything else? A clue to the solution I am thinking of: assume they are standing on a pebbled path with many white and black stones similar to the ones in the bag.
Brendan said
She stumbles and drops the rock. She says look into the bag and whatever stone it has she had the other.