If Freedom makes a voyage to Guadeloupe in week 1 and to Trinidad in week 2, which one of the following must be true?

Ravi on April 30, 2019

@izyat,

Great question. You know that you can use a hypothetical from a
previous question if all of the rules introduced in the new question
are satisfied by the previous hypothetical. If they are all
satisfied—and the question is a must be true—then you can use the hypo
from the previous question to answer the current question.

The question says, "If Freedom makes a voyage to Guadeloupe in week
1and a voyage to Jamaica in week 5, which one of the following must be
true?"

If J is 5th, we know G is 4th, and because G is also 1st, M has to go
6th because otherwise, there'd be no way we could satisfy the M-G-M
chain. From this, we know that (E) is the correct answer since it must
be true.

Does this answer your question? Let us know if you have any other questions!

NS1 on May 14, 2020

This question pretty much requires you to look at previous questions because you wouldn't necessarily be able to solve it just off of using the rules given in the question, correct?

Nick on May 19, 2020

How can G be first if it must fall somewhere between the two voyages to M

Skylar on June 25, 2020

@NS1, happy to help!

It is definitely possible to solve this question without relying on a previous hypothetical. We could use information from the question and our setup to create the same possible arrangement with relative ease. However, it is more efficient to manipulate our previous hypothetical instead since we are facing time constraints.

Does that make sense? Hope it helps! Please let us know if you have any other questions!

Skylar on June 25, 2020

Happy to help!

Rule #3 states: "Freedom will make exactly two voyages to Martinique, and at least one voyage to Guadeloupe will occur in some week between those two voyages."

As you noted, we must have a voyage to G that falls between the two voyages to M. However, we are never told that this has to be the only voyage to G scheduled. It is entirely possible to have one voyage to G scheduled for the first week and another voyage to G scheduled in between the two voyages to M.

This is exemplified in the hypothetical we use to solve the question:
G T M G J M T
1 2 3 4 5 6 7

Does that make sense? Hope it helps! Please let us know if you have any other questions!