.Employees can be classified according to gender (male, female), income (low, medium, high), and rank (assistant, instructor, dean). How many different ways can one person be classified? 4. How many ways can four paintings be arranged on a wall? 5. How many ways can 3 fraternity members be selected from 10, if one is to be president, one is to be vice-president, and the third is to be treasurer? 6. How many different passwords are there if the first character must be a letter and the other three must be digits? 7. There are 12 applicants for financial aid. The selection comity may choose only 4. How many ways can this be done? 8. A candy store allows customers to select 3 different candies to be packed and mailed. If there are 13 different types of candy, then how many ways can this selection be done?