David,

This is the same fallacy that allows all of those gambling system-hawkers to tout their crap.


Each roll ALWAYS gives you 6/36 chances to roll a 7. If you were going to phrase the question as "Over how many rolls, all considered together, would it take until rolling a 7..." then you might be able to sell the 5/6 *5/6 *5/6 *5/6 = 48.22% chance of NOT rolling a 7 anytime during those 4 rolls....


But since I know you know that already, I'm wondering what your point was... unless it was to set up the next question (good trick, by the way)