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EQUATOR.H34
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1990-04-04
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34
SUMMATION
Summation is used to find the product or sum of a series of numbers.
The summation sign for addition is and its sum is written :
Sn = a
The product summation sign is and the product of its terms is :
Pn = a
where k is the index of summation and the sum or product of the
terms is expressed as 'a as k goes from 1 to n.