Year 12 maths · E.2 · Sequences and Series
Find terms of a geometric sequence
Each term is the one before times the common ratio.
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Find the common ratio of the sequence 5, 15, 45, 135, …
Answer: 3
Find the common ratio of the sequence 4, 16, 64, 256, …
Answer: 4
Find the common ratio of the sequence −2, −10, −50, −250, …
Answer: 5
Tip: Each term is the one before times the common ratio.
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