I got the same answers as ssumitsh. Thanks for confirming.
Ian, I guess the question means that the O, U, E must all have to be in either of 2, 4, 6, 8 postions. 3 vowels will occupy the 3 even positions and a consonant will occupy the other even postion.
yeah, i thought about that later. I just don't think it's really an issue. I've never seen anything even that challanging on the GMAT, nor have I heard of anyone seeing anything like that.
I really try not to overstress about combinations. There are so many other more important topics to learn the nuances of. This one's usually right there on the surface.