Question 8
Kitty the cat lives in a three-room house. Every morning she goes from the living room to the kitchen to eat, then outside. Finally she goes to the bedroom without passing through the kitchen. She must use the doors shown on the plan. In how many ways can she complete this routine?
Editorial route convention: take the direct living-room-to-kitchen door, then a kitchen door directly outside; return through the living room to the bedroom, with no detours or repeated rooms within a stage. Choices differ by the doors used.
Editorial route convention: take the direct living-room-to-kitchen door, then a kitchen door directly outside; return through the living room to the bedroom, with no detours or repeated rooms within a stage. Choices differ by the doors used.