Sign up now
to enroll in courses, follow best educators, interact with the community and track your progress.
Principle of Inclusion and Exclusion
a year ago
how did you get a intersection b in the nationality question if possible tell me my mistake too we can consider the group of Dutch and britishers to sit together that we consider them to be a single quantity and number of ways to arrange them with the others is 2! and now the people inside of this quantity can be arranged in 2! number of ways hence 4