IKMC 2020 - Grades 7-8 - Set 2 - Self-study Question 20

Question 20

Aisha folds the five-cell paper strip numbered 1,2,3,4,5 so all cells overlap in five layers. Which top-to-bottom order is impossible?

Question illustration

3,5,4,2,1
3,4,5,1,2
3,2,1,4,5
3,1,2,4,5
3,4,2,1,5