Permutations

Permutations refer to the different ways in which a set of items can be arranged or ordered. In mathematical terms, when we talk about permutations, we are often concerned with the arrangement of a subset of items taken from a larger set, as well as the total arrangements of all items in a set. ### Key Points about Permutations: 1. **Definition**: The arrangement of 'n' distinct objects taken 'r' at a time is called a permutation.