The Free Throw Problem

来源: 于 2012-09-26 19:00:03 [旧帖] [给我悄悄话] 本文已被阅读：次
The Free Throw Problem


A basketball player has been keeping up with her career statistics. Before the begining of her senior season, she was hitting less than 80% of her free throws. At the end of her senior season, she was hitting more than 80% of her free throws. Must there be a time during her senior season when she was hitting exactly 80% of her free throws? Prove your claim.



查了一下，好像以前没人贴过，不过WXC的search也不可靠，要是问过了，先抱歉一下。