Question 472698
nCr=combination of n things taken r at a time.=n!/((n-r)!*r!)
Assuming that the letters are chosen without replacement:
((4C2 * 5C1) + (4C3))/9C3
=((6*5)+4)/9C3
=34/84
=17/42 the probability of having more than one vowel.
.
Ed