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Black Marbles

Number of Marbles in a Bag Containing Black and White Marbles

Problem
If 2 marbles are removed at random from a bag containing black and white marbles, the chance that they are both white is 1/3. If 3 are removed at random, the chance that they all are white is 1/6. How many black marbles are there?
 

Answer Key

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Number of black marbles = 4
 

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