In how many ways can the letters of the word ABEIX be arranged in a row so that the vowels appear in alphabetic order?	Choose the correct answer
A) 20  B) 30  C) 40  D) 50  E) 60
three letters can be arranged in 3! ways.   only one combination AEI is required.   5 letters can be arranged in 5! ways.   thus 5!/ 3! * 1 = 20.   20
<result>A</result>
In how many ways can the letters of the word ABEIX be arranged in a row so that the vowels appear in alphabetic order?