Find the interval of convergence of the series. 
Definitions:
Hooded Jacket
A type of apparel that includes a hood attached to it, often used for casual wear or protection against weather.
Departmental Overhead Rate
A calculation used to allocate overhead costs to specific departments, based on varying bases such as labor hours or machine hours.
Manufacturing Overhead Costs
Manufacturing overhead costs include all the indirect costs associated with producing goods, such as utilities, rent for production facilities, and maintenance expenses.
Machine Hours
A measurement of production time, tracking the amount of time machines are operated in the manufacturing process.
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