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Equal Chance (Posted on 2009-08-03) Difficulty: 3 of 5
Lana and Lois each had 15 red and 6 blue marbles. Each placed at least 1 red marble and at least 4 blue marbles into a bag (each had her own bag for this purpose). Each calculated the probability that if she drew out four marbles from her own bag that all four drawn would be blue. It turns out that both the probabilities are the same even though Lana had put more marbles in her bag than Lois had put in hers.

How many of each color had been placed in each bag?

See The Solution Submitted by Charlie    
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  Subject Author Date
SolutionSolutionBrian Smith2017-07-26 21:11:01
Hintsed bottemiller2009-08-03 13:43:04
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