Mathematics for IGCSE & O level - Sequences (Section 3 - No. 2)
Which sequence is a quadratic sequence?
2, 5, 8, 11, ...
1, 4, 9, 16, ...
3, 9, 27, 81, ...
4, 8, 12, 16, ...
Explanation
Quadratic sequence has a constant second difference.
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