I remember a study that I presume is that one as it is so similar to what you are saying not saying that that you are better off being given the answer "right away" but that you are better off being given an answer after a bit of struggle, but not like, just letting you off in the desert and hoping for the best... I'd be shocked if it helped to simply give people the answer right away and I just don't remember the study--at least the one I remember--saying that.