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A certain bank designates each item with a one-, two- or [#permalink]
12 Feb 2006, 00:13
A certain bank designates each item with a one-, two- or three letter code, where each letter is selected from the 26 letters of the alphabet. If the letter may be repeated and if the same letters used in a different order constitute a different code, how many items is it possible to uniquely designate with these codes?