The symbol '∑' denotes the summation of a series. It represents adding up all the terms of a sequence from n=1 to infinity.
Partial Sum: The sum of only some terms in a series, starting from an initial term and ending at a specified term.
Infinite Series: A series where there are infinitely many terms being added together.
Finite Series: A series where there are only finitely many terms being added together.
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