Example:

Find the nth term of the arithemetic sequence: 3, 7, 11, 15, 19

Solution:

The common difference between each is 4. So we will have 4n.

The first term is 3 and to get from 4 to 3 we have to take away 1. So we will have 4n - 1.

The expression for the nth term of the sequence is 4n -1.

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