A stock clerk in a grocery store has gotten used to

Last updated: 7/27/2022

A stock clerk in a grocery store has gotten used to arranging eight kinds of cereal on a certain shelf. The manager insists on four of the kinds being in a particular order but does not care about the rest. What is the probability that a new employee will arrange the shelf the way the manager likes without special instruction? a) 1/840 b) 1/336 c) 1/6720 d) 1/1,680