Can you save the astrologer ?

Once upon a time there was dictator. An astrologer forecast something bad for him; so the dictator awarded death penalty to the astrologer. The latter pleded for his life, so the dictator gave him a chance to save himself and decreed as follows: "I will allow you to put 2 white balls and 2 black balls in any manner you like in two urns without disclosing it to anybody. My executioner will choose one of the urns, dip his hand into it and take out a ball. If the bll is black he will cut of your head and if its white, then you are saved." What would you advise the astrologer to do, in order to give himself the maximum probability of saving his life \(?\)

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