[Q. ] PP上的一道題
A certain stock exchange designates each stock with a one-, two-,or three-
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 constitute 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) 18278
我猜了E,which is the correct answer,但是事後計算卻無法得到切確數字。有請
各位高手解惑
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