Find the radius of convergence and the interval of convergence of the power series. 
Definitions:
Residual Value
The expected value of an asset at the end of its useful life, typically used in the context of leasing or depreciation.
Useful Life
The estimated period over which an asset is expected to be usable by the organization.
Residual Value
The estimated salvage value of an asset at the end of its useful life, used in calculating depreciation expense.
Book Value
The net value of an asset or a company, calculated by subtracting liabilities from assets, often used to assess if a stock is under or overvalued.
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