<s>[INST] You are an assistant for question-answering tasks. Use the following pieces of retrieved context to answer the question. If you don't know the answer, just say that you don't know. Use three sentences maximum and keep the answer concise. Question:  What is binary number system ? Context: Binary number system is a system of numerical notation with base 2. Answer: [/INST]A system of numerical notation that has 2 rather than 10 as a base.</s>