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 Description  
 Series:  A summation of the terms in a sequence.

Examples:

S = 1 + 2 + 3 + 4 + 5 = 15.

S = -2 + 4 - 6 + 8 - 10 + 12 - 14 = -8.

S = 1 - 4 - 9 - 16 - 25 - 36 - 49 - 64 - 81 - 100 - = ???