Combinatoricsmedium
0:00.0
How many permutations of {1, 2, 3, 4, 5, 6} have 1 in the first position and 6 in the last position?
How many permutations of {1, 2, 3, 4, 5, 6} have 1 in the first position and 6 in the last position?
How many permutations of {1, 2, 3, 4, 5, 6} have 1 in the first position and 6 in the last position?