[問題]GMATPrep Math Question

[peche]

GMAT new PP
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 lettersof the alphabet. Which of the following gives the max 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)

ans C)

我最後依句話根本就看不懂 我當時選的最大的一個數
麻煩幫我解釋一下~ 多謝~多謝 ^^

[zazer.lin]

GMAT new PP
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 lettersof the alphabet. Which of the following gives the max 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)

那句話是問說這些code最多可以產生幾種不同的stock (name)

(4 letter) + (5 letter)
= 26*26*26*26 + 26*26*26*26*26
= 26[sup]4[/sup] + 26[sup]5[/sup]
= 26[sup]4[/sup](1 + 26)