Skip to content / Đến nội dung
ThichHocToan.com

HKIMO 2026 Grade 6 National Preliminary Set 02 Question 4

HKIMO · HKIMO 2026 Grade 6 National Preliminary Set 02

Question 4

Find the missing number: $1,3,7,13,21,?,43,57$.
  1. 31
  2. 35
  3. 24
  4. 36