প্রশ্ন ও সমাধান

A company sells packages of decorative papers, each containing three sheets of paper. The available colors are: red, orange, green, blue, and purple. Each package must conform to the following rules:Each package must contain sheets of either two or three different colors.A package containing any orange sheet must also contain at least one red sheet.A package containing any red sheet must also contain at least one orange sheet.Blue and purple sheets cannot be packed in the same package.A package containing any green sheet must also contain at least one purple sheet, but a package containing purple sheet need not contain green sheet.An acceptable package CANNOT contain two sheets of-