选择题
2004 AMC 8 Problem 11: Rearranging Five Numbers
The numbers −2, 4, 6, 9 and 12 are rearranged according to these rules: 1. The largest is not first, but it is in one of the first three places. 2. The smallest is not last, but it is in one of the last three places. 3. The median is not first or last. What is the average of the first and last numbers?
A.
3.5
B.
5
C.
6.5
D.
7.5
E.
8