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Fifth Year 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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  1. Find the common ratio of the sequence 5, 15, 45, 135, …

    Answer: 3

  2. Find the common ratio of the sequence 4, 16, 64, 256, …

    Answer: 4

  3. 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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