AMC 8 2005 Problem 8
AMC8 2005 年第 8 题
奇偶性★★☆☆☆
Suppose m and n are positive odd integers. Which of the following must also be an odd integer?
假设 m 和 n 都是正奇数，下面哪个一定也是奇数？
- A.m+3n
- B.3m-n
- C.
- D.
- E.3mn
正确答案 · Correct Answer
E
解析 · Solution
Solution 1
Assume WLOG that and are both 1. Plugging into each of the choices, we get 4, 2, 6, 16, and 3. The only odd integer is 3mn.
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