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How many integers between 0 and 8 inclusive have an inverse modulo 9?

Hintz PLZ?

 May 22, 2022
edited by Guest  May 22, 2022
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An integer k has inverse modulo 9 if gcd(k, 9) = 1.

 

Checking one by one, the integers that have inverse modulo 9 are 1, 2, 4, 5, 7, 8.

 May 22, 2022

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