Hello everybody! May I ask you a big favor? I need help. What I have is: A bag contains marbles of three different colors with at least three marbles of each color. Three marbles are randomly selected, without replacement. How many different color combinations are possible? I tried to use Combinatorial Calculator here: http://www.numberempire.com/combinatorialcalculator.php?n=3&m=3&o... <http://www.numberempire.com/combinatorialcalculator.php?n=3&m=3&o... And I've got : 10 Seems like it is the right answer, because textbook shows me the same.. But I want to understand the way of solving it. Please show me step by step solution or the formula. Thanks in advance. -- View this message in context: http://drools.46999.n3.nabble.com/Math-question-tp4021789.html Sent from the Drools: User forum mailing list archive at Nabble.com.