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A constant-step sequence makes the same jump every time.
same jump, every time
2, 4, 6, 8, ?
20, 15, 10, 5, ?
18, 15, 12, 9, ?
Concrete · counters
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Pictorial · number path
2+24+26
Abstract · equations
+2+2+2
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Sequence Solver!
Use +N when a pattern grows and -N when it shrinks.