The sequence is arithmetic if the difference between every two consecutive terms is always the same.
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It is an arithmetic sequence if you can establish that the difference between any term in the sequence and the one before it has a constant value.
In order to determine whether or not this is an arithmetic sequence, there must be at least 3 numbers.
It is an arithmetic sequence for which the index goes on and on (and on).
That's an arithmetic sequence.
Arithmetic