Find the next number: 3, 6, 11, 18, ?
- A.25
- B.29
- C.31
- D.27 ✓
Explanation: The differences are 3, 5, 7 — increasing by 2 each time. The next difference is 9, so 18 + 9 = 27.
Class 6 IMO Mathematics Olympiad practice · Patterns & Sequences · Number & Letter Sequences
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