Hexagonal numbers go 1, 7, 19, 37, ... (the gap between terms increases by 6 each time). What are the next two hexagonal numbers after 37?
- A.61 and 91 ✓
- B.55 and 73
- C.58 and 85
- D.64 and 97
Explanation: Gaps go 6, 12, 18, 24, 30: 37+24=61, then 61+30=91.
Class 6 IMO Mathematics Olympiad practice · Algebraic Thinking · Patterns in Mathematics
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