Skip to content / Đến nội dung
ThichHocToan.com

VTMO 2017 — Grade 8 — semifinal Question 6

VTMO · VTMO 2017 — Grade 8 — semifinal

Question 6

All $46$ lamps are off. Each move toggles exactly three distinct lamps. What is the minimum moves to turn all on?
  1. $15$
  2. $16$
  3. $17$
  4. $18$
  5. $19$