Respuesta :

20scollins
A pattern in which 3 is added to each number to get the following number. 

Answer:

Infinite arithmetic series.

Step-by-step explanation:

In the given set of numbers 6, 9, 12, 15..........

we find the difference in each successive term is = 9 - 6 = 3

12 - 9 = 3

Since number of the terms are infinite so it's a series and there is a common difference of 3 in each successive term of the series, so set of these numbers is an Infinite Arithmetic series.