41.
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)
81.If each term in the sum a1 + a2 + . . . + an is either 7 or 77 and the
sum equals 350, which of the following could be equal to n ?
(A) 38
(B) 39
(C) 40
(D) 41
(E) 42
想請問一下這兩題在問什麼?
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