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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: 940
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Kudos [?]: 62 [0], given: 0

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?
Director
Joined: 13 Nov 2003
Posts: 793
Location: BULGARIA
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Kudos [?]: 26 [0], given: 0

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: 5078
Location: Singapore
Followers: 22

Kudos [?]: 184 [0], given: 0

Agree with that.
Director
Joined: 17 Oct 2005
Posts: 940
Followers: 1

Kudos [?]: 62 [0], given: 0

26+26^2+26^3 is the oa
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