One digit in each of these identification numbers of a postal money order is smudged. Can you

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One digit in each of these identification numbers of a postal money order is smudged. Can you recover the smudged digit, indicated by a Q, in each of these numbers?
a) 493212Q0688
b) 850Q9103858
c) 2Q941007734
d) 66687Q03201

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Discrete Mathematics and Its Applications

ISBN: 978-0073383095

7th edition

Authors: Kenneth H. Rosen

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Question Posted: May 02, 2016 12:26 PM

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One digit in each of these identification numbers of a postal money order is smudged. Can you

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In each case we know that x n x 1 x 2 x 3 x 4 x 5 x 5 x 1 x 5 x 9 x 10 mod 9 See the preamble to Exe...View the full answer

Discrete Mathematics and Its Applications

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