1. Math
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  3. 3 a box contains 4 white and 4 black discs...

Question: 3 a box contains 4 white and 4 black discs...

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3. A box contains 4 white and 4 black discs. A trial consists of selecting four discs from the box. If two are white and two are black then we stop. Otherwise, we replace the discs in the box, and repeat. This continues until exactly two of the four discs are white. Let X be the number of trials. Find the probability that X is equal to n, where n is in the set of natural numbers.
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