Which of these sequences represents Virahānka numbers (each number is the sum of the two before it, starting 1, 2)?
- A.1, 2, 3, 5, 8, 13 ✓
- B.1, 2, 4, 8, 16
- C.1, 3, 5, 7, 9
- D.2, 4, 6, 8, 10
Explanation: Starting from 1 and 2: 1+2=3, 2+3=5, 3+5=8, 5+8=13 — giving 1, 2, 3, 5, 8, 13.
Class 6 IMO Mathematics Olympiad practice · Algebraic Thinking · Patterns in Mathematics
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