# What is the next four terms in the arithmetic sequence: 12, 16, 20,...?

##### 1 Answer

Nov 19, 2016

#### Explanation:

We know that in an arithmetic progression we have **common difference** is given by $$d=a_i-a_{i-1}$$ for 'any working

So: $$d=a_3-a_2=20-16=4$$ or as well $$d=a_2-a_1=16-12=4$$

Now simply $$a_4=a_3+d=20+4=24$$