2. Write a verbal description for the set
A = {a, b, c, d, e...}
A is a set of English alphabet.
3. Write a verbal description for the set
A = {5, 10, 15, 20}
A is a set of positive multiple of 5 from 5 to 20.
4. Write a rule or method of the set
A = {5, 10, 15, 20}
A = {x/x is a multiple of 5; 5 ≤ x ≤ 20}
