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

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Director
Joined: 17 Oct 2005
Posts: 928
A certain bank designates each item with a one-, two- or [#permalink]

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12 Feb 2006, 01:13
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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?
Director
Joined: 13 Nov 2003
Posts: 789
Location: BULGARIA

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12 Feb 2006, 03:04
with one letter-26
with 2 letters-26x26
with three letters-26x26x26
or 26+26^2+26^3
GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5043
Location: Singapore

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12 Feb 2006, 23:13
Agree with that.
Director
Joined: 17 Oct 2005
Posts: 928

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13 Feb 2006, 14:59
26+26^2+26^3 is the oa
13 Feb 2006, 14:59
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