Permutations are arrangements of the numbers $1,\ldots,n$ in an arbitrary order.
Permutations are arrangements of the numbers $1,\ldots,n$ in an arbitrary order. There are $n!$ many permutations, forming a group known as the symmetric group.
Permutations are arrangements of the numbers $1,\ldots,n$ in an arbitrary order.
Permutations are arrangements of the numbers $1,\ldots,n$ in an arbitrary order. There are $n!$ many permutations, forming a group known as the symmetric group.