Nov JJ Questions, Pls!!!!!
Nov JJ Questions, Pls!!!!!
115. 一个12个数的集合,最小的数是-4,后一项比前一项大1,问正整数的range
【机委】11
[????应该是7吧???]
8 、某CITY,卖了62%的新房和75%的老房子(分别为E和N)。
如果“3 TIMES AS MANY E WAS SOLD AS N”,
问卖了的房子占总房子的比例。
请注意“3 TIMES AS MANY E WAS SOLD AS N”的意思,
是3N=E,还是N=3E。我搞了半天也不确定,如果错了,很冤。
【讨论】是E=3N吧
[???天啊,语法!! what's the answer?]
74 6学生分三祖,每组给3种地图种的一种,问共多少种可能?
【讨论】 C(6,2)*C(4,2)*P(3,3)/P(3,3)=90,
R:同沸沸笔记中先分堆再全排列再去重复的思路。
[???用不用除以P3,3?? how to think of this?]
82. |_____|______|_______|________|
X 0 Y xy间长小于8,问x-0间长是否<4?
(1) x0
(2) 0y<6
【讨论】A
[is (1) correct?] |