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Journal Article

A Variation on the Money-Changing Problem

Lance Bryant, James Hamblin and Lenny Jones
The American Mathematical Monthly
Vol. 119, No. 5 (May 2012), pp. 406-414
DOI: 10.4169/amer.math.monthly.119.05.406
Stable URL: http://www.jstor.org/stable/10.4169/amer.math.monthly.119.05.406
Page Count: 9
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A Variation on the Money-Changing Problem
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Abstract

Abstract The classical money-changing problem is to determine what amounts of money can be made with a given set of denominations. We present a variation on this problem and ask the following question: For what denominations of money a1, a2, …, at is there exactly one way, using the fewest number of coins possible, to make change for every amount that can be made? We provide a solution to this problem when we have at most three denominations.

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