Answer: arithmetic
Step-by-step explanation:
An arithmetic sequence is when you ADD a number (d) to the previous number to create the next numbers in the sequence.
A geometric sequence is when you MULTIPLY a number (r) to the previos number to create the next numbers in the sequence.
[tex]n_1 = 3+(1)a\\n_2=3+(2)a\\n_3=3+(3)a[/tex]
Notice that "a" is added to each term in the sequence.
