Question

what is an arithmetic sequence?

Answer 1

a sequence with a common difference like

1,3, 5,7 ....

is a sequence with a common difference of 2

Answer 2

1,2,3,4,5,6

is also a sequence with a common difference of 1

Answer 3

Also in case you dont know the difference between series and a sequence.

A series is a sum like 1+2+3+4.... that will be an arithmetic series

where as I like to think of a sequence as a list. 1, 2, 3, 4 arithmetic sequence