Concept explainers
UPS. United Parcel Service uses the same check digit method used on U.S. Postal Money Orders and airline tickets for its package-tracking numbers. What would be the check digit for UPS tracking number 84200912?
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The Heart of Mathematics: An Invitation to Effective Thinking, WileyPLUS NextGen Card with Loose-leaf Set Single Semester: An Invitation to Effective Thinking (Key Curriculum Press)
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