Question 5
A museum has four floors. Each floor has seven rooms numbered 1 to 7, as shown below. Some doors connect the rooms.
The plans show Floors 1 and 2 above Floors 3 and 4. “Cửa vào” means entrance and “Lối ra” means exit.
On how many floors can a visitor start at the entrance, visit every room exactly once, and then leave through the exit?
The plans show Floors 1 and 2 above Floors 3 and 4. “Cửa vào” means entrance and “Lối ra” means exit.
On how many floors can a visitor start at the entrance, visit every room exactly once, and then leave through the exit?