In a certain city there are n straight streets, such that every two streets intersect, and no three streets pass through the same intersection. The City Council wants to organize the city by design...
In how many of the distinct permutations of the letters in 'MISSISSIPPI' do the 4 I's not come together ?
In how many of the distinct permutations of the letters in 'MISSISSIPPI' do the 4 I's not come together ?
