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A certain bank designates each item with a one-, two- or

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Director
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A certain bank designates each item with a one-, two- or [#permalink] New post 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?
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 [#permalink] New post 12 Feb 2006, 02:04
with one letter-26
with 2 letters-26x26
with three letters-26x26x26
or 26+26^2+26^3
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 [#permalink] New post 12 Feb 2006, 22:13
Agree with that. :wink:
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 [#permalink] New post 13 Feb 2006, 13:59
26+26^2+26^3 is the oa
  [#permalink] 13 Feb 2006, 13:59
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A certain bank designates each item with a one-, two- or

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