a and b Side by Side
Difficulty: Medium · Topics: Discrete Mathematics, Permutations
A=\a,b,c,d,e,f,g\
In how many of the 4-permutations of A do a and b both appear, next to each other?
Difficulty: Medium · Topics: Discrete Mathematics, Permutations
A=\a,b,c,d,e,f,g\
In how many of the 4-permutations of A do a and b both appear, next to each other?