In each of the scenarios below, their father puts a red or blue hat on each of their heads. Alice can see Bob’s and Charlie’s hats, but not her own; Bob can see only Charlie’s hat; Charlie can see none of the hats. At least one of you has a red hat.” Alice then says “I know the colour of my hat.” What colour is each person’s hat? What colour is Charlie’s hat? Two of you who are seated adjacently both have red hats.” Alice then says “I don’t know the colour of my hat.” What colour is Charlie’s hat?

Source: The Guardian November 07, 2016 07:07 UTC