CR

[drowsy-goose]

Cả nhà vừa relax vừa kíu câu này mới:

There are at least three people in the room. At most two people in the room recognize each other. At least one person in the room recognizes everybody else in the room.
Which one of the following is NOT consistent with the above?
A. Four people are in the room
B. No two people in the room recognize each other
C. At most one person in the room recognizes everybody else in the room
D. Anyone in the room who recognizes any other person in the room is also recognized by that person
E. Two people in the room recognize everyone else in the room

[vnf]

Cả nhà vừa relax vừa kíu câu này mới:

There are at least three people in the room. At most two people in the room recognize each other. At least one person in the room recognizes everybody else in the room.
Which one of the following is NOT consistent with the above?
A. Four people are in the room
B. No two people in the room recognize each other
C. At most one person in the room recognizes everybody else in the room
D. Anyone in the room who recognizes any other person in the room is also recognized by that person
E. Two people in the room recognize everyone else in the room

(D) it is

Because if "Anyone in the room who recognizes any other person in the room is also recognized by that person" => there could be more than two people in the room recognize each other => this conflicts with "at most two people ...."

[drowsy-goose]

Đúng là trong 1.5p em đã bị rối tung lên vì cái câu này bác ạ. Nhưng lúc bình tĩnh thì thấy sao nó đơn giản thế. Đúng là đi thi thì cái vấn đề tâm lý quả là quan trọng.Thanks bác Vnf.