有關GRE數學:網絡課堂邏輯筆記

Passage 2

An old painting portrays a seated jury of exactly six persons arranged in two parallel rows of three persons each. Each person in the back row is directly behind one person in the front row. The positions of the six jurors, numbered 1 through 6 by historians, appear in the painting as follows:

Back row, left to right- 4 5 6

Front row, left to right- 1 2 3

Inscribed on the back of the paintings are the names of exactly five persons-Urquart, Vere, Winters, Young, and Zeno. The historians know that each of these five persons is a juror portrayed in the painting. The name of the sixth person in the painting is unknown. The only additional information that historians have comes from letters of the time, which indicate the following.

Zeno is in position 5.

Young is directly behind Winters.

Urquart is not in the same row as Vere.

1. If the juryf front row is made up, from left to right, of Urquart, the juror whose name is unknown, and Winters, which of the following must be true?

Vere is in position 4.

Vere is in position 5.

Vere is in position 6.

Young is in position 4.

Young is in position 5.

2. If one of the two rows is made up, from left to right, of Winters, the juror whose name is unknown, and Vere, then Urquart must be in position