Mathematics for IGCSE & O level - Sequences (Section 2 - No. 22)
Which of the following sequences is geometric?
2, 4, 6, 8, ...
1, 2, 4, 8, ...
1, 4, 9, 16, ...
3, 5, 7, 9, ...
Giải thích
In a geometric sequence, you multiply a common ratio to get to the next term.