Respuesta :
Answer:
Its three.
Step-by-step explanation:
When you see a sequence such as this one, it is called an arithmetic sequence. You must add to get to the next term. So, the amount of numbers that you need to get from 3 to 6, 6 to 9, and 9 to 12 would be the common difference, so the common difference in this specific sequence would be 3.
