I don't think these big guns asked such kind of questions to check knowledge of a person.they are the most creative companies of current times,actually they won't need a person who just portray as wise and most experienced.they need a man who can think in most unconventional way it possible with least efforts.
My conclusions are it's not about how correct or wrong you are in reaching the answer.its what logic you used to get to that answered.thats important.