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Find the sum of the arithmetic sequence.
-{-6n - 1}, n = 38
Labour Hours
The total number of hours worked by employees in a specified period, commonly used as a measure of labor input.
Cast Bronze Valves
Valves made from cast bronze material, often used in plumbing and industrial applications for controlling the flow of liquids or gases.
Labour Productivity
The measure of the efficiency of a person, machine, factory, or system in converting inputs into useful outputs.
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