Write an inequality to describe the region consisting of all points between (but not on) the
spheres of radius 
and 
centered at the origin.
Definitions:
Discount Series
A sequence of discounts applied one after the other, often used to determine the final price after multiple discounts are applied.
Trade Discount
A reduction in the price of goods or services offered by a seller to a buyer in the business-to-business market.
Discount Series
A sequence of discounts applied one after the other to reduce a product's price or to calculate the present value of a stream of future payments.
Invoice Notation
Symbols or codes used on an invoice to provide specific information about the transaction or goods involved.
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