In a stack of three cards with holes, the top of each card is white and the bottom is grey. Basil threaded these cards on a rope.
After some arrangement of the cards, which situation is possible to obtain without untying the rope ?
IKMC Grade 1 - 2
Câu hỏi liên quan
It takes Professor Geogre 16 minutes to cycle from the first lamp post to the fifth one. How long will it take him to cycle past the tenth lamp post ?