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1991 AHSME Problems/Problem 28: Revision history

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10 February 2019

24 February 2018

28 September 2014

5 July 2013

19 February 2012

  • curprev 09:5609:56, 19 February 2012 Ckorr2003 talk contribs 566 bytes +566 Created page with "Initially an urn contains 100 white and 100 black marbles. Repeatedly 3 marbles are removed (at random) from the urn and replaced with some marbles from a pile outside the urn as..."
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