Questions 18-24

　　Eight people—Jack¹, Karen Laura, Mark, Nick Owen, Peggy, and Ruth— will be placed on two four-person teams—X and Y—for a realy race that is run in four successive legs first, second third and fourth The teams race concurrently² Each team member runs exactly one of the legs, one team member per leg according to the following conditions

　　Jack is on the same team as Karen

　　Karen is not on the same team as Nick

　　Ruth runs an earlier leg of the race than Peggy runs

　　Whether or not they on the same team as each other

　　Mark and Nick are both on team Y

　　Neither Jack nor Mark runs third

　　Karen and Laura both run second

　　Owen runs fourth

18. Which one of the following must be true?

(A) If Jack and Owen are assigned to the same team as each other Jack runs 　　first
(B) If Jack and Peggy are assigned to the same team as each other Jack runs 　　fourth
(C) If Jack and Ruth are assigned to the same team as each other Ruth runs 　　third
(D) If Mark and Owen are assigned to the same team as each other Mark runs 　　fourth
(E) If Mark and Ruth are assigned to the same team as each other. Ruth runs 　　third

19. If Ruth is assigned to team X which one of the following is a complete and accurate list of the legs that she could run?

(A) first
(B) second
(C) first, second
(D) first, third
(E) second, third

20. If Owen and Ruth are assigned to the same team as each other which one of the following must be true?

(A) Mark runs fourth
(B) Nick runs first
(C) Nick runs fourth
(D) Peggy runs first
(E) Peggy runs fourth

21. Any of the following can be true EXCEPT

(A) Jack runs first
(B) Mark runs fourth
(C) Nick runs first
(D) Nick and Peggy both run third
(E) Owen and Peggy both run fourth

22. If Ruth and Peggy are assigned to the same team as each other which one of the following must be true?

(A) Jack runs first
(B) Mark runs fourth
(C) Nick runs third
(D) Peggy runs third
(E) Ruth runs first

23. Any of the following can be true EXCEPT

(A) Jack runs fourth
(B) Nick runs fourth
(C) Peggy runs fourth
(D) Ruth runs first
(E) Ruth runs third

24. If Peggy runs third on the same team to which Jack is assigned which one of the following must be true?

(A) Jack runs the first leg on the team to which he is assigned
(B) Ruth runs the first leg on the team to which she is assigned
(C) Owen runs on the same team as Jack
(D) Owen runs on the same team as Mark.
(E) Ruth runs on the same team as Mark

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