gre的网络课堂笔记

Four women-G, H, I, and J-and four men-R, S, T, and U-are the eight people to be seated at a rectangular table. Three of the people are to sit on one side of the table, three are to sit on the other side of the table, one is to sit at the head of the table, and one is to sit at the foot of the table. The following restrictions on seating arrangements must be observed:

Persons of the same sex cannot sit next to each other on the same side of the table.

The person seated at the foot of the table cannot be the same sex as the person seated at the head of the table.

T cannot be seated on the same side of the table as I.

U cannot be seated on the same side of the table as J.

1. If U is seated at the head of the table and I is seated in the middle seat on one side of the table, which of the following must be true?

J is seated at the foot of the table.

R is seated at the foot of the table.

G is seated on the same side of the table as I.

S is seated on the opposite side of the table from I.

T is seated on the opposite side of the table from I.

2. If J is to be seated at the head of the table, each of the following could be seated at the foot of the table EXCEPT

3. If S is seated at the foot of the table, U is seated in an end seat on one side of the table, and I is seated in an end seat on the other side of the table, where must T be seated?