# Quiz 9 #### Which of the following is a property of a group in abstract algebra? * [x] It has an identity element * [x] The result of adding any two members is also in the set * [ ] It must include multiplication * [ ] It must include division **Note to Learners** A group is a set of elements that satisfies the following: 1. When you add (or apply an operation to) any two members of the set, the result is also in the set. 2. There is an identity element – a unique value in the set that leaves other elements unchanged when combined with them. To learn more about it, you can follow the course [ECDSA Prerequisites](https://bsvblockchain.360learning.com/course/play/68dbb07606cfc0fb12dbac4d) --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://hub.bsvblockchain.org/higher-learning/bsv-academy/bitcoin-primitives-digital-signatures/quiz/quiz-9.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.