There's only one thing that's different: the spaces. If you count spaces, it's most likely your answer is wrong.
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An ordered pair has to be in parentheses and there has to be a comma in between the numbers (example: (2,6). An ordered pair is for a coordinate graph.
It is an ordered set of numbers such that the difference between adjacent numbers is a constant.
An arithmetic sequence is an ordered set of numbers such that the difference between any two successive members of the set is a constant.
An arithmetic sequence is an ordered set of numbers such that the difference between any two successive members of the set is a constant.
When the order in which they are given makes no difference.