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, ...

Giải thích

A linear sequence must have a constant difference.

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