All of the stocks onthe over-the-counter market are designated by either a 4-letter or a 5-lettercode that is created by using the 26 letters of the alphabet. Which of the following gives the maximumnumber of different stocks that can be designated with these codes?
~$2\left ( 26^{5} \right )$~
~$26\left ( 26^{4} \right )$~
~$27\left ( 26^{4} \right )$~
~$26\left ( 26^{5} \right )$~
~$27\left ( 26^{5} \right )$~
五种字母的同理:26^5
两种可能性相加
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