prep_math_41[没问过]

黄公子

41.   5676-!-item-!-187;#058&004686

All of the stocks on the over-the-counter market are designated by either a 4-letter or a 5-letter code that is created by using the 26 letters of the alphabet.  Which of the following gives the maximum number of different stocks that can be designated with these codes?

 

(A) 2(26^5)

(B) 26(26^4)

(C) 27(26^4)

(D) 26(26^5)

(E) 27(26^5)

答案:C

此题置顶贴没查到，请教

rubygo

26^5+26^4=26^4(26+1)=27*26^4

所以C

黄公子

哦，了解，谢谢