A sequence is an ordered list of numbers; the numbers in this ordered list are called elements or terms. A series is the value you get when you add up all the terms of a sequence; this value is called the sum. For instance, 1, 2, 3, 4 is a sequence, with terms "1", "2", "3", and "4"; the corresponding series is the sum 1 + 2 + 3 + 4, and the value of the series is 10. A sequence may be named or referred to as A or An.
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