Let R = Z20
Let $R = \mathbb{Z}_{20}$, which denotes the set of integers modulo 20. That is, $R = \{0, 1, 2, \dots, 19\}$ with addition and multiplication defined modulo 20. In algebra, $\mathbb{Z}_{n}$ is a well-known example of a commutative ring with unity. In this case, the additive identity is __________ ____ _______ ________ ___ _____ _____ _____ _________ ______ _______.
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