# Algebra 1 : How to find the answer to an arithmetic sequence

## Example Questions

### Example Question #33 : Sequences

Which of the following is an example of an arithmetic sequence?

Each of these sequences is an arithmetic sequence.

Each of these sequences is an arithmetic sequence.

Explanation:

In each case, the terms increase by the same number, so all of these sequences are arithmetic.

Each term is the result of adding 1 to the previous term. 1 is the common difference.

Each term is the result of subtracting 1 from - or, equivalently, adding  to - the previous term.  is the common difference.

The common difference is 0 in a constant sequence such as this.

Each term is the result of adding  to the previous term.  is the common difference.

### Example Question #34 : Sequences

Which of the following numbers completes the arithmetic sequence below?

{13, 25, __, 49}