Hello,

The difference of these digits forms an Arithmetic Progression.

Like 25 - 19 = 6 and 19 - 14 = 5 and 14 - 10 = 4.

Therefore the next term is going to be 10 - 7 = 3 and 7 - 5 = 2 .

So to solve this question you need to make Arithmetic progression by finding difference between the consecutive terms.

So the complete series will be 25, 19, 14, 10, 7, 5.

Hope this was helpful.