The word EQUATION contains all five vowels. How many $3$ letter "words" consisting of at least $1$ vowel and $1$ consonant can be made from the letters of EQUATION?
Hi, would anyone be able to check the answer for this? The answers say 540, but I keep getting 270.
My means of working out were taking two cases: one with two vowels and one consonant, and one with one vowel and two consonants.