which are the invertible elements of(Z,+,.)
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Step-by-step explanation:
An element is invertible if and only if it is relatively prime to 20. The set of these elements is called the group of units. In this case, that would be 1,3,7,9,11,13,17,19. The proof of this follows directly from Euclid's Theorem on the greatest common divisor.
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