LOGIC GAMES-pt 42, game 2, loading docks.

Sheendream
Posts: 21
Joined: Tue Apr 19, 2011 10:24 am

LOGIC GAMES-pt 42, game 2, loading docks.

Postby Sheendream » Sun Sep 04, 2011 1:47 pm

The only q's I got wrong on this section were #8 and #12, both from game 2. They are both questions regarding "for exactly how many of the six bays is the type of cargo that bay is holding completely determined?"

I usually draw hypotheticals but this is extremely time consuming and I still seem to get them wrong. This is really my only weakness in LG's. Can someone provide some light on how to improve on these types of q's? Thanks!

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timmydoeslsat
Posts: 148
Joined: Wed Aug 03, 2011 2:07 pm

Re: LOGIC GAMES-pt 42, game 2, loading docks.

Postby timmydoeslsat » Sun Sep 04, 2011 2:48 pm

Diagram:

Image

The only variable we do not know the placement of is M and the order of the PT/TP block.

M is a free agent/floater/random in this game and it places an important role in the two questions you have.

#8.

Image

The question stem tells us that M and G are separated by exactly one variable. Notice that we either have M_G or G_M.

We could never have a situation of G_M because we do not have enough variables to accomplish this. After M is placed, no more variables can come after G, all must come before. So this scenario is out.

That means that we must have M_G.

The M is placed, so we must go with our sequencing tree we have in our global diagram. We now know that the L must come between the M and G. The L is the closest variable to G. We know that the F will be first and that the PT/TP block will come after it. However, the order of that PT/TP block is not solved by a mere sequence of M_G, this we only know the exact placement of four variables because P and T are not known.


#12

Image

With P going fourth, we know that only two variables can go after it. Looking at our sequencing tree we know that it must be L and then G. T could not come after P because where would L and G go? Same with M. Where would L and G go? Not enough room.

Image

We know that T must come directly before P now. So that will be the occupation of the third slot. However, now we are caught in uncertainty. We know that F must come before T, but it does not have to come immediately before T. And we know that the placement of M is a random thing, thus we do not know for certain where F and T go. This is shown below by the box that can flip the placement of M and F.

Image

Sheendream
Posts: 21
Joined: Tue Apr 19, 2011 10:24 am

Re: LOGIC GAMES-pt 42, game 2, loading docks.

Postby Sheendream » Sun Sep 04, 2011 6:00 pm

That's perfect, thank you so much. Greatly appreciated, good luck with your studying!




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