# How do you write the expression for the nth term of the sequence given #1, 4, 7, 10, 13,...#?

##### 2 Answers

#### Explanation:

#### Explanation:

We should recognise that

The expression for the nth term can be determined from the formula, but there is a short cut.

As soon as see that

Now you just have find what must be added or subtracted to start at the correct first term.

Let

Let

It would seem that the expression we want is:

Check with

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Using the formula :

In