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treviglaslibrary

Answer:

If they increase by the same amount each time.

So E.g. 1 3 5 7 9 (+ 2 each time)

BUT NOT e.g. 1 5 6 8 (+ random each time)

If they increase by the same amount each time.

So E.g. 1 3 5 7 9 (+ 2 each time)