AMC8 1993
AMC8 1993 · Q23
AMC8 1993 · Q23. It mainly tests Logic puzzles.
Five runners, P, Q, R, S, T, have a race, and P beats Q, P beats R, Q beats S, and T finishes after P and before Q. Who could NOT have finished third in the race?
五个跑步者 P、Q、R、S、T 参加比赛,P 打败 Q,P 打败 R,Q 打败 S,T 在 P 之后 Q 之前结束。谁不可能获得第三名?
(A)
P and Q
P 和 Q
(B)
P and R
P 和 R
(C)
P and S
P 和 S
(D)
P and T
P 和 T
(E)
P, S and T
P, S 和 T
Answer
Correct choice: (C)
正确答案:(C)
Solution
Answer (C): Since $P$, $T$ and $Q$ must finish in front of $S$, $S$ cannot be third. Since $P$ is the winner, $P$ cannot be third. Thus the only possible orders are $PRTQS$, $PTRQS$, $PTQRS$ and $PTQSR$, which show that anyone except $P$ and $S$ could finish third.
答案(C):由于 $P$、$T$ 和 $Q$ 必须排在 $S$ 前面,$S$ 不可能获得第三名。由于 $P$ 是获胜者,$P$ 不可能获得第三名。因此,唯一可能的顺序是 $PRTQS$、$PTRQS$、$PTQRS$ 和 $PTQSR$,这表明除了 $P$ 和 $S$ 之外,其他人都可能获得第三名。
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