How many permutations are there?
Do you like Algebra? If the answer is yes, you obviously know that the number of permutations of n distinct objects is n factorial usually written as “n!”. Not too many people know that the study of permutations of finite sets is a topic in the field of combinatorics. This means the product of all positive integers less than or equal to n. It is interesting to know the fact that the notion of permutation relates to the act of permuting, or rearranging members of a set into a particular sequence or order.