we know that
In an Arithmetic Sequence the difference between one term and the next is a constant
The constant term added to each term to generate the next term is called common difference
We can write an Arithmetic Sequence as a rule:
xn = a1 + d(n−1)
where
a1 is the first term
d is the "common difference" between terms
n is the numbers of terms
therefore
the answer is
Arithmetic Sequence