Permutation/Ordered Selection/Examples/3 from 3

Example of Permutations
There are $6$ permutations of $3$ objects taken $3$ at a time:
 * $a \, b \, c \quad a \, c \, b \quad b \, a \, c \quad b \, c \, a \quad c \, a \, b \quad c \, b \, a$

In two-row notation on the permutations on $3$ letters:
 * $\dbinom {1 \ 2 \ 3} { 1 \ 2 \ 3}, \dbinom {1 \ 2 \ 3} { 1 \ 3 \ 2}, \dbinom {1 \ 2 \ 3} { 2 \ 1 \ 3}, \dbinom {1 \ 2 \ 3} { 2 \ 3 \ 1}, \dbinom {1 \ 2 \ 3} { 3 \ 1 \ 2}, \dbinom {1 \ 2 \ 3} { 3 \ 2 \ 1}$