Introductory Combinatorics
Introductory Combinatorics
5th Edition
ISBN: 9780134689616
Author: Brualdi, Richard A.
Publisher: Pearson,
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Chapter 6, Problem 32E
To determine

To prove: The identity ϕ(n)=ni=1k(11pi), where ϕ(n)={k:1kn,GCD{k,n}=1}.

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Introductory Combinatorics

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