# Permutations

When we look at the schedules of trains, buses and the flights we really wonder how they are scheduled according to the public's convenience. Of course permutation is very much helpful to prepare the schedules on departure and arrival of these. Also when we come across license plates of vehicles which consists of few alphabets and digits. We can easily prepare these codes using permutations.

Apart from this we we can find how many signals can be made with the given flags of different colors, the number of different digit numbers that can be formed from the given digits. In this section let us see about the basic principle called Fundamental Counting principle, Definition of Permutation, its formula, few examples and the practice problems.