The word EQUATION contains all 5 vowels. How many 3 letter "words" consisting of at least 1 vowel and 1 consonant can be made from the letters of EQUATION?
okay, my working:
5C1(choosing 1 vowel from 5) x 3C1 (choosing one consonant)x 6C1(the rest) x 3!(no. of combs)
=540
and the answers...