Question 12
Color some arrows in this diagram so that:
- Each uncolored arrow points toward exactly one other uncolored arrow.
- Each colored arrow points toward exactly two other colored arrows.
How many arrows are colored?
Editorial clarification of “points toward”: count every arrow along the indicated straight ray, not only the nearest arrow.
- Each uncolored arrow points toward exactly one other uncolored arrow.
- Each colored arrow points toward exactly two other colored arrows.
How many arrows are colored?
Editorial clarification of “points toward”: count every arrow along the indicated straight ray, not only the nearest arrow.