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Abstract Algebra

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Moderate

Well-Defined Elements Mod N

ABSALG-GTQLN1

Which of the following quantities is not a well-defined element of $\mathbb{Z}/15\mathbb{Z}$?

A

$\cfrac{1}{4}$

B

$\cfrac{2}{9}$

C

$\cfrac{3}{2}$

D

$\cfrac{4}{4}$