Sequences and series

What this lesson shows

3… then 7… then 11… then 15… What's the pattern — and what comes next?

Try it yourself

Real questions from this lesson's worksheets — answers below each one.

1. Arithmetic sequence: first term 1, common difference 1. Find term 4
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   4
2. Arithmetic sequence: 1, 3, 5, … What is the common difference?
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   2
3. Arithmetic sequence: 2, 4, 6, … What is the common difference?
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   2
4. Arithmetic sequence: first term 2, common difference 1. Find term 4
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   5