Suppose an urn contains 10 marbles: 4 are white and 6 are black. We will draw marbles randomly, without replacement, until the urn is empty. Define the concept "whack" as follows: • A marble is whack if it is either (i) white and one of the first 5 marbles drawn, or (ii) black and one of the last 5 marbles drawn. If the first 4 draws are whack, what is the probability the 5th draw will also be whack?

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