A cruise line is scheduling seven week-long voyages for the ship Freedom. Each voyage will occur in exactly one of the first seven weeks of the season: week 1 through 7. Each voyage will be to exactly one of four destinations: G, J, M, or T. Each destination willl be scheduled for at least one of the weeks. The followng conditions apply to Freedom's schedule:
J will not be its destination in week 4
T will be its destination in week 7
Freedom will make exactly two voyages to M, and at least one voyage to G will occur in some week between those two voyages
G will be its destination in the week preceding any voyage it makes to J
No destination will be scheduled for consecutive weeks
Q11.Which one of the following is an acceptable schedule of destinations for Freedom, in order from week 1 through 7?
a) G, J, M, T, G, M, T
c) J, M, G, M, G, J, T
=> 왜 c 가 아닌지??
Q13. If Freedom makes a voyage to T in week 5, which one of the following could be true?
a) Freedom makes a voyage to T in week 1
b) Freedom makes a voyage to M in week 2
c) Freedom makes a voyage to G in week 3
d) Freedom makes a voyage to M in week 4
e) Freedom makes a voyage to J in week 6
=> 왜 d 가 답인지??