Word Count : 293

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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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