A classic children's toy consists of 11 different blocks that combine to form a rectangle showing a man's face. Each block has four sides with alternatives for that part of the face; for example, the block for the right eye might have a closed eye on one side, a partially open eye on another, and so on. A child can turn any block and so change that part of the face, and in this way many different faces can be formed. 

 

 If a child makes one change each minute and spends 43 hours a week changing faces, how many years will it take to see every possible face?

 

Answer rating: 100% (QA)

To calculate how many years it will take for a child to see every possible face by making one change ... View the full answer