Use the inclusion/exclusion principle to prove the following: If n = pqr, where p, q
Chapter 9, Problem 41(choose chapter or problem)
For 40 and 41, use the definition of the Euler phi function ? on page 396.Use the inclusion/exclusion principle to prove the following:If n = pqr, where p, q, and r are distinct prime numbers,
then ?(n) = (p ? 1)(q ? 1)(r ? 1).
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