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Preliminary Exam CSAT October 26

1.  A box contains 5 sets of balls while there are 3 bails in each set. Each set of balls has one colour which is different from every other set. What is the least number of balls that must be removed from the box in order to claim with certainty that a pair of bails of the same colour has been removed?

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Some Reference Essays

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List of previous year essay topics (1997-2019)

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