Skip to content / Đến nội dung
ThichHocToan.com

MathNet 2009-part-01 — 175 problems (EN–VI) Question 79

Math Olympiad Vault · MathNet 2009-part-01 — 175 problems (EN–VI)

Question 79

An ant crawls in plane as follows: it initially crawls 1 cm in either direction. Then, after each step, it turns $60^\circ$ to the left or to the right and crawls 1 cm in the new direction.
Question illustration
Is it possible for it to return to its starting point in
(a) 2008 steps?
(b) 2009 steps?