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stacks..

by necromancer_678 » Sun Jul 26, 2009 5:16 am
93) Each stack is designated with a 1, 2, and 3 letter code where each letter is selected from the 26 letters of the alphabet. If the letters may be repeated and if the same letters used in a different order constitutes a different code, how many different stocks is it possible to uniquely designate with these codes?
a. 2951
b. 8125
c. 15600
d. 16302
e. 8278
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by shibal » Sun Jul 26, 2009 5:48 am
26+26^2+26^3
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by necromancer_678 » Sun Jul 26, 2009 6:04 am
well my friend..that does not match any of the answer choices :X
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by shibal » Sun Jul 26, 2009 6:10 am
the answer should be 18278.... maybe option E is missing a digit....

im pretty sure this is the right answer, since for the 1st code we can have 26 different codes, for the 2letter code it can be 26*26 and for the 3 letters 26^3.. add them up and u get 18278
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