What are the examples of finite set?

Examples of finite set: 1. Let P = {5, 10, 15, 20, 25, 30} Then, P is a finite set and n(P) = 6. 2. Let Q = {natural numbers less than 25} Then, Q is a finite set and n(P) = 24. 3. Let R = {whole numbers between 5 and 45} Then, R is a finite set and n(R) = 38. 4. Let S = {x : x ? Z and x^2 –