LSAT 逻辑游戏题（1）

sdcar2010

At the annual meeting of the Magicians' Alliance, 8 magicians-L, M, N, O, P, Q, R, and S- perform their latest illusions, one magician at a time. The order in which the magicians perform their illusions is consistent with the following conditions:

L and Q each perform at some time after P.
S performs at some time before O and L.
M performs at some time before S.
P performs at some time after N.
S and N each perform at some time after R.

1. Which one of the following could be the order in which the magicians perform their illusions?

(A) M, N, R, S, P, Q, L, O
(B) S, M, R, N, P, L, Q, O
(C) R, N, M, P, O, S, Q, L
(D) R, M, S, L, N, P, Q, O
(E) M, R, S, N, O, P, Q, L


2. Which one of the following magicians CANNOT perform third?

(A) M
(B) N
(C) O
(D) P
(E) S


3. If O is the fourth magician to perform, then which one of the following must be true?

(A) M is the second magician to perform.
(B) L is the fifth magician to perform.
(C) P is the sixth magician to perform.
(D) Q is the seventh magician to perform.
(E) L is the eighth magician to perform.


4. If P performs before S, then each of the following must be false EXCEPT:

(A) R is the third magician to perform.
(B) S is the fourth magician to perform.
(C) P is the fifth magician to perform.
(D) Q is the sixth magician to perform.
(E) S is the seventh magician to perform.


5. If R performs after M and O performs before P, then which one of the following could be true?

(A) M is the second magician to perform.
(B) O is the third magician to perform.
(C) N is the fourth magician to perform.
(D) S is the fifth magician to perform.
(E) L is the sixth magician to perform.

sdcar2010

The key is to move forward everyday!  It's a long march, not a sprint.  And you have to train your brain and your eyes.

wow that must be your personal favorate diagram form ^^! kinda dizzy for me to understand, but it definatly save plenty of time when answering under stress -.-

dam, after 2 month preparation, I am still one of those who can  only answer 1/2-2/3 of questions under 35m

-- by 会员 taoransk (2010/11/7 11:44:20)

taoransk

wow that must be your personal favorate diagram form ^^! kinda dizzy for me to understand, but it definatly save plenty of time when answering under stress -.-

dam, after 2 month preparation, I am still one of those who can  only answer 1/2-2/3 of questions under 35m

sdcar2010

Excellent job, taoransk.  You nailed it!

I am going to attach a diagram for this game, if the system allows me to do so.

taoransk

8个量: LMNOPQRS
P<LQ
S<OL
M<S
N<
R<SN

结构图:
                     < Q
          N < P  ---
 R < ------ < L
 -----  S  ------
    M <  |       < O


1. Which one of the following could be the order in which the magicians perform their illusions?

R或M起始,去除(B)
R=1/2,去除(A)
P<LQ,去除(D)
S<OL,去除(C)

答案(E)

2. Which one of the following magicians CANNOT perform third?

(A) M  M<(R?)    M只说在S前但没有说是否比N前...相对来说甚至可以是RNPQMSLO的组合
(B) N  N<R<(M)
(C) O  O<S,S<RM  O至少是4
(D) P  <N<R
(E) S  S<RM
答案(C)

3. If O is the fourth magician to perform, then which one of the following must be true?

O=4, 123一定是SRM,其中S=3, R&M=1&2
N<<QL, N=5, P=6, Q&L=7&8

R/M R/M  S   O   N   P  Q/L Q/L
1   2   3   4   5   6   7   8

答案(C)

4. If P performs before S, then each of the following must be false EXCEPT:

P<S:
             
                 < Q
 R < N < P ---    O
 -------  < S < ---
     M  -------     L

答案(D)


5. If R performs after M and O performs before P, then which one of the following could be true?

M<R, O<

  -----     N    -----  Q
M < R < ----- < P < ---
  -----  S < O  -----  L
 
答案(C)