Mathematics for IGCSE & O level - Sequences (Section 4 - No. 43)

Which of these is a quadratic sequence?

4, 8, 12, 16,...

1, 3, 5, 7, ...

1, 4, 9, 16, ...

2, 6, 18, 54, ...

Paliwanag

A quadratic sequence has a constant second difference.

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