Is the following sequence geometric or arithmetic? why?

3, 6, 9, 12, 15,

[20 points]

Arthimetic sequence

Step-by-step explanation:

It is because the difference between 2 consecutive number is constant. In geometric series the difference between two numbers is the ratio between them.

Formula : tn=a+(n-1)d

a=1st term

n=nth term

d=difference

but in geometric sequence

formula: tn= ar^n-1

a=1st term

r=ration

n=nth term