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from a bag containing 12 identical blue balls, y identical [#permalink]
22 Aug 2006, 11:47
from a bag containing 12 identical blue balls, y identical yellow balls and no other balls, one ball will be removed at random. If the probability is less than 2/5 that the removed ball will be blue, what is the least number of yellow balls that must be in the bag?
Last edited by lan583 on 11 Feb 2007, 07:52, edited 1 time in total.