Question 7
The city has four kinds of banknote shown here.
Cells are numbered left to right, top to bottom.
For example, cells 1,2,6 distinguish the notes as shown; “Ô” means cell and “Kết luận” means conclusion.
It is also possible to distinguish all four notes by looking at just two cells. If their numbers sum to S, what is the remainder when S is divided by 4?
Cells are numbered left to right, top to bottom.
For example, cells 1,2,6 distinguish the notes as shown; “Ô” means cell and “Kết luận” means conclusion.
It is also possible to distinguish all four notes by looking at just two cells. If their numbers sum to S, what is the remainder when S is divided by 4?