– 10, – 6, – 2, 2, ... is _________________. 

Given series: – 10, – 6, – 2, 2, ...

We know that in an AP, every next term has a constant common difference from the preceding term.

In the series $-10, -6, -2, 2, ...$, if the difference between the two consecutive terms is given by:

–6 – (–10) = 4

–2 – (–6) = 4

2 – (–2) = 4 

Here, every next term increase by number 4. 

So, it is an AP with a common difference of 4.