I think we should change 16 to 20....we get C(24,4)=...

來源: jinjing 於 2010-09-08 09:35:30 [舊帖] [給我悄悄話] 本文已被閱讀：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.