(a) For c, d, n, m Z, with n > 1 and m > 0, prove...
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b) If xnxn-1 ∙∙∙∙∙∙∙ x1\x0 = xn • 10 + ∙∙∙∙∙∙ + x\ • 10 + x0 denotes an (n + 1)-digit integer, then prove that
xnxn-i ∙∙∙∙∙∙∙∙ x1x0 = xn + xn-1 +∙∙∙∙∙∙∙∙∙+ x1 + x0 (mod 9).
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Related Book For
Discrete and Combinatorial Mathematics An Applied Introduction
ISBN: 978-0201726343
5th edition
Authors: Ralph P. Grimaldi
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