How do you know if a coin is lucky?
I've heard people talking about lucky coins. They believe certain coins bring good luck and fortune. But I'm not sure how to identify a lucky coin. Is there a specific way to know if a coin is considered lucky?
How to know if a coin is legit?
I'm trying to figure out whether a coin is legitimate or not. I want to understand the factors or features that can help me determine its authenticity. How can I know if a coin is really what it claims to be?
How to tell if a number is prime?
Could you please elaborate on the process of determining whether a given number is prime or not? I'm particularly interested in understanding the steps involved and any specific techniques or algorithms that might be used for this purpose. Could you also explain how we can efficiently check for primality, especially for large numbers? Additionally, are there any common mistakes or pitfalls that people often encounter when trying to determine primality? I would appreciate it if you could provide a clear and concise explanation.