Find the number of ways all 10 letters of the the word COPENHAGEN can be arranged so that
1 the vowels(A, E,O) are together and the consonants (C, G,H, N,P) are together
2 the Es are not next to each other.
Four letters are selected from the 10 letters of the word COPENHAGEN.
3 Find the number of different selections if thefour letters must contain the same number of Es and Ns with at least one of each.