really don't think so. The ad.com. will think that you are not clear of what you want to do after school and neither do you really know why MBA/PhD now. As my suggestion, think thoroughly and try to make the painstaking choice between mba and phd.
maybe not a good idea. the career paths after mba and phd are dramatically different, i image it will be very difficult to explain to the school why you want two totally "opposite" things at the same time.
