Mathematics for IGCSE & O level - Sequences (Section 2 - No. 31)
Which of these sequences is *not* a linear sequence?
2, 4, 6, 8, ...
1, 3, 5, 7, ...
1, 4, 9, 16, ...
5, 10, 15, 20, ...
Explanation
A linear sequence must have a constant difference.
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