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七个学生:四年制KIM 和 LEE
三年制PAT和ROBIN
两年制SANDY, TERRY AND VAL
有三种房间可供选择:SINGLE, DOUBLE AND TRIBLE 每间至少1人,至多3人。
根据下列规则安排:
1、 KIM/LEE ≠ TRIBLE
2、 SANDY/TERRY/VAL ≠ SINGLE
3、 LEE ≠ROBIN
4、 KIM = PAT
整理,隐含条件KIM=S/D, KIM=PAT → KIM = PAT
T: SANDY TERRY VAL ROBIN
D: KIM = PAT
S: ROBIN LEE
LEE ≠ ROBIN KIM = PAT
1、 排除法 选C
2、 ROBIN = S → SANDY/TERRY/VAL = T, LEE=S, KIM/PAT = D, 或3D 选B
3、 KIM = S/D, PAT = KIM → PAT = KIM = D
4、 ROBIN = T → 有一个两年制的学生为D,且和LEE在一起。
5、 T和V 为不同的D,→ 3D1S,而且,LEE=S
6、 排除法,选C
Questions 7-11
A worker will insert colored light bulbs into a billboard equipped
with exactly three light sockets, which are labeled lights 1, 2, and 3.
The worker has three green bulbs, three purple bulbs, and three yellow
bulbs. Selections of bulbs for the sockets is governed by the following
conditions:
Whenever light 1 is purple, light 2 must be yellow.
Whenever light 2 is green, light 1 must be green.
Whenever light 3 is either purple or yellow, light 2 must be
purple.
整理分析:
1、 1 2 3
P y
2、 g G
3、 p P/Y
大写为主选项,小写为从选项
不受限制的排列: g/y y/p g
7、 选D
8、 选A
9、 选A
10、 1、2不符合规则,因为1、2都需要GREEN。3、 p/p//P/Y 选B
11、 PYG GPY YPG 利用排除法选A