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A certain stock exchange designates each stock with one, two [#permalink]
26 Apr 2006, 01:33
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A certain stock exchange designates each stock with one, two or three letter code, where each letter is selected from 26 letters of the alphabet. If the letters may be repeated and if the same letters used in a different order constitute a different code, how many different stocks is it possible to uniquely designate with these codes?