DAT Achiever - PAT Exam #2, Q67 (cubes - figure attached)

[caligirlie]

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I have a very specific question about DAT Achiever - PAT Exam #2, Q67 (cubes). I have attached the figure to this thread. In column IV of the cube figure (counting from left to right), there is a seeming "hole" instead of a cube. However, the DAT achiever answer key counts it as a cube. There is no need for the cube because there is no cube on top of it that requires support. However, it is impossible to visually decipher whether or not there is a cube there. Do we assume there is a cube there as DAT Achiever does, or should we not count this as a cube? Does the real PAT cube section have really tricky items like this? Does anyone know?
Thanks!

 

[dat_student]

I have a very specific question about DAT Achiever - PAT Exam #2, Q67 (cubes). I have attached the figure to this thread. In column IV of the cube figure (counting from left to right), there is a seeming "hole" instead of a cube. However, the DAT achiever answer key counts it as a cube. There is no need for the cube because there is no cube on top of it that requires support. However, it is impossible to visually decipher whether or not there is a cube there. Do we assume there is a cube there as DAT Achiever does, or should we not count this as a cube? Does the real PAT cube section have really tricky items like this? Does anyone know?
Thanks!

I marked the two places I'd consider a hole:
http://img60.imageshack.us/my.php?image=datachieverq67oncubecounting0n.gif

P.S. Gone to hospital, bb later today

 

[caligirlie]

I agree with the "holes" you selected - but DAT Achiever doesn't. I am hoping the real test won't be as ambiguous!

 

[mitshi]

I agree with the "holes" you selected - but DAT Achiever doesn't. I am hoping the real test won't be as ambiguous!

Hi, don't confuse yourself. A hole is only present when you can see both the vertical and horizontal line at the spot of concern.

 

[caligirlie]

Thanks mitshi. That was very helpful. I'll go with your rule and cross my fingers.

Hi, don't confuse yourself. A hole is only present when you can see both the vertical and horizontal line at the spot of concern.

 

[mitshi]

No Problem, caligirlie. Make sure you score 15 out of 15 for the Cubes section all the time in order to compensate for the more challenging ones like Pattern Folding, Keyhole, Orthographic,... Feel free to post more questions if need be. If I'm not around, I'm sure other SDNer will be willing to help. 🙂

 

[dat_student]

Hi, don't confuse yourself. A hole is only present when you can see both the vertical and horizontal line at the spot of concern.

Why is it not a hole???!!! you can't see the horizontal and vertical lines because one cube is blocking those 2 lines. There is no cube on top of that cube. Don't these mean it's a hole???!!!!!!!

 

[mitshi]

Why is it not a hole???!!! you can't see the horizontal and vertical lines because one cube us blocking those 2 lines. There is no cube on top of that cube. Doesn't these mean it's a hole???!!!!!!!

In real exam, hole(s) are always very clear. I've rotated the model and drawn something to illustrate what I meant by "hole" at the expense of incurring ambiguity on the other spot I noted (which will not happen in the real thing though).

It's hidden cube(s) to be assumed of its/their existence there in order to support something on top. You may check with the ADA, but I don't think a spot may be considered a hole if there's no cube on top of it.

 

[dat_student]

In real exam, hole(s) are always very clear. I've rotated the model and drawn something to illustrate what I meant by "hole" at the expense of incurring ambiguity on the other spot I noted (which will not happen in the real thing though).

It's hidden cube(s) to be assumed of its/their existence there in order to support something on top. You may check with the ADA, but I don't think a spot may be considered a hole if there's no cube on top of it.

If you rotate it the other way I'd still say you have the same 2 holes. 😉

 

[mitshi]

If you rotate it the other way I'd still say you have the same 2 holes. 😉

Yes, but as I noted, this figure is not easy to orient without comprising the view of the other cube.

Take a look at the following. It's taken from Figure A of PAT 3. 🙂

 

[dat_student]

Yes, but as I noted, this figure is not easy to orient without comprising the view of the other cube.

Take a look at the following. It's taken from Figure A of PAT 3. 🙂

but for the figure on the left you say "this'll not be a hole" when, based on the rules, it's a hole even in that view.

 

[mitshi]

but for the figure on the left you say "this'll not be a hole" when, based on the rules, it's a hole even in that view.

Right, but I'm just illustrating to you that if it ever needs to be hole, it will be oriented to something like the figure on the right.

 

[Flipper405]

What are the rules regarding the holes? I don't see what the difference would be between the example you provided and the original question of the thread as far as being able to tell whether it's a hole or not. I would think it both instances you would assume there's a cube there unless you can see both lines to show that there isn't one.

I guess it's just only assume there's a cube when it's needed for support?

 

[mitshi]

What are the rules regarding the holes? I don't see what the difference would be between the example you provided and the original question of the thread as far as being able to tell whether it's a hole or not. I would think it both instances you would assume there's a cube there unless you can see both lines to show that there isn't one.

I guess it's just only assume there's a cube when it's needed for support?

All that you said are what I meant from the very first post in this thread. I'm just going a step further to help dat_student visualize a hole and a non-hole situation. Please don't get confused and over complicated for the "cubes". It's supposed to be the easiest section in PAT.

Like I mentioned earlier, you guys should pay attention to other more challenging sections like Keyhole, TFE, Pattern Folding... 🙂