Questions:

1.) Stephen was looking at a photo. Someone asked him, "Whose picture are you looking at?" He replied: "I don't have any brother or sister, but this man's father is my father's son." So, whose picture was Stephen looking at?

2.) There was a robbery in which a lot of goods were stolen. The robber(s) left in a truck. It is known that : (1) No one other than A, B and C was involved in the robbery. (2) C never commits a crime without inviting A to be his accomplice. (3) B does not know how to drive. So, is A innocent or guilty?

3.) Suppose there is such a little town : (1) No two inhabitants have exactly the same number of hairs. (2) No inhabitant has exactly 409 hairs. (3) There are more inhabitants than there are hairs on the head of any inhabitant. So, what is the largest possible number of inhabitants in that little town?










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1.) The man in the photo is Stephen's son.

2.) A is guilty.

3.) 409