Write the given series in summation notation. 
Definitions:
Economic Profits
Profits exceeding the total costs of resources used, including both explicit and implicit costs.
Opportunity Costs
The financial loss associated with overlooking the alternative that is considered second-best when making a choice.
Average Total Cost
The total cost of production (fixed and variable costs combined) divided by the total quantity of output produced.
Competitive Market
A market structure characterized by a large number of sellers and buyers, free entry and exit, and products that are similar enough to be considered substitutes, leading to price competition.
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