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Definition.The definition of the summation process:
Summation is the addition of a set of numbers. The result is their sum.
Sums can be represented by the summation symbol, a capital Sigma. This is defined as:
Here, i is the index of summation; m is the lower bound of summation, and n is the upper bound of summation.
Most Commonly Useful Formulas:
sum of combination of n things taken i at a time (see binomials )