How many ways are there to arrange the letters of the word EDUCATION so that all the following three conditions hold?
– the vowels occur in the same order (EUAIO);
– the consonants occur in the same order(DCTN);
– no two consonants are next to each other.
15
Vowels can be arranged in one way.
There will be 6 gaps around them. We need 4 gaps as the arrangement can be done in one way.
Therefore, 6C4=15