Find the next number: 1, 2, 4, 7, 11, 16, ?
- A.20
- B.21
- C.22 ✓
- D.23
Explanation: The differences are 1, 2, 3, 4, 5 — increasing by 1 each time. Next difference is 6, so 16+6=22.
Class 6 IMO Mathematics Olympiad practice · Patterns & Sequences · Number & Letter Sequences
← All Number & Letter Sequences questions