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An ant is clinging to one corner of a box in the shape of a

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An ant is clinging to one corner of a box in the shape of a [#permalink] New post 28 Jun 2012, 17:58
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An ant is clinging to one corner of a box in the shape of a cube. The ant wants to get to the most distant corner of the box by crawling only along the edges of the cube and without ever revisiting a place it has been. How many different paths can the ant take to the most distant corner?

A. 6
B. 12
C. 18
D. 24
E. 30
[Reveal] Spoiler: OA
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Re: Manhatta quant set 3 [#permalink] New post 28 Jun 2012, 22:42
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vibhav wrote:
An ant is clinging to one corner of a box in the shape of a cube. The ant wants to get to the most distant corner of the box by crawling only along the edges of the cube and without ever revisiting a place it has been. How many different paths can the ant take to the most distant corner?

A. 6
B.12
C.18
D.24
E.30


Make the cube and select two opposite corners. One where the ant is right now and the second is where it wants to reach.
Notice that from its current position, it has 3 different paths that it can take i.e. it has 3 possible options. Make the ant move on any one path out of these 3.
Once one path is chosen, it has two different paths it can take (it cannot take the third one since it cannot revisit the third point). Make the ant move on any one path out of these 2.
Now, from this point, it again has 3 options to reach the point where it wanted to reach. Notice that the case will be the same even if you had selected different paths in the first two moves because it is a cube so all sides are the same.

Total number of different paths = 3*2*3 = 18
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Expert Post
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An ant is clinging to one corner of a box in the shape of a [#permalink] New post 16 Jul 2014, 20:57
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JusTLucK04 wrote:
JusTLucK04 wrote:
@ Bunuel I have to type it all over again coz u deleted my last post.. :angry

Here how does the ant have 3 choices after the second path..It again has 2 choices..
Also it misses all the complex paths that the ant visits not in 3 steps..say in 5 or 7 steps..(It is possible)

Either I misunderstood the Q and the E or the explanation is incorrect

I guess the way would be:
No of ways to do in-
3 steps: 3*2*1=6
5 steps: 3*2*1*1*1=6
7 steps: 3*2*1*1*1*1*1=6
No more steps are possible: total 18 ways

Experts please comment


Bumping for review...Karishma & Bunuel..please review the solution in view of the above approach I have posted


Here is the reason the number of paths is 3*2*3 and how it takes everything into consideration:

Attachment:
Ques3.jpg
Ques3.jpg [ 6.31 KiB | Viewed 210 times ]

I think the first two steps are clear so the first step is taken in 3 ways and second step in 2 ways. Now, draw the cube and see that the ant would be at one of three points (the points where you reach after traversing 2 edges) - E, C, G

For each of these points, there are 3 unique ways in which the ant can reach the desired vertex.

1st way - Directly go to the desired point. If it is an E, this means EF
2nd way - Go via 3 edges e.g. if it came from AD- DE, it goes EH-HG-GF
3rd way - Go via 5 edges e.g. if it came from AD- DE, it goes EH-HG-GB-BC-CF
Since it is a cube, we know that what works for one edge, will work for other two as well.

So you multiply 3*2 by 3 to get 18.
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Re: Manhatta quant set 3 [#permalink] New post 28 Jun 2012, 17:59
guys any idea how this problem can be solved algebraically? the OE essentially sketches out the different paths, which will be very tedious on G day.
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Re: An ant is clinging to one corner of a box in the shape of a [#permalink] New post 29 May 2014, 12:13
@ Bunuel I have to type it all over again coz u deleted my last post.. :angry

Here how does the ant have 3 choices after the second path..It again has 2 choices..
Also it misses all the complex paths that the ant visits not in 3 steps..say in 5 or 7 steps..(It is possible)

Either I misunderstood the Q and the E or the explanation is incorrect

I guess the way would be:
No of ways to do in-
3 steps: 3*2*1=6
5 steps: 3*2*1*1*1=6
7 steps: 3*2*1*1*1*1*1=6
No more steps are possible: total 18 ways

Experts please comment
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An ant is clinging to one corner of a box in the shape of a [#permalink] New post 12 Jul 2014, 20:07
VeritasPrepKarishma wrote:
vibhav wrote:
An ant is clinging to one corner of a box in the shape of a cube. The ant wants to get to the most distant corner of the box by crawling only along the edges of the cube and without ever revisiting a place it has been. How many different paths can the ant take to the most distant corner?

A. 6
B.12
C.18
D.24
E.30


Make the cube and select two opposite corners. One where the ant is right now and the second is where it wants to reach.
Notice that from its current position, it has 3 different paths that it can take i.e. it has 3 possible options. Make the ant move on any one path out of these 3.
Once one path is chosen, it has two different paths it can take (it cannot take the third one since it cannot revisit the third point). Make the ant move on any one path out of these 2.
Now, from this point, it again has 3 options to reach the point where it wanted to reach. Notice that the case will be the same even if you had selected different paths in the first two moves because it is a cube so all sides are the same.

Total number of different paths = 3*2*3 = 18

Hi Karishma
I could not get how there are three paths from the second point. Could you please explain in detail. Thanks :)
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Re: An ant is clinging to one corner of a box in the shape of a [#permalink] New post 16 Jul 2014, 11:55
JusTLucK04 wrote:
@ Bunuel I have to type it all over again coz u deleted my last post.. :angry

Here how does the ant have 3 choices after the second path..It again has 2 choices..
Also it misses all the complex paths that the ant visits not in 3 steps..say in 5 or 7 steps..(It is possible)

Either I misunderstood the Q and the E or the explanation is incorrect

I guess the way would be:
No of ways to do in-
3 steps: 3*2*1=6
5 steps: 3*2*1*1*1=6
7 steps: 3*2*1*1*1*1*1=6
No more steps are possible: total 18 ways

Experts please comment


Bumping for review...Karishma & Bunuel..please review the solution in view of the above approach I have posted
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An ant is clinging to one corner of a box in the shape of a [#permalink] New post 16 Jul 2014, 21:00
Expert's post
JusTLucK04 wrote:
JusTLucK04 wrote:
@ Bunuel I have to type it all over again coz u deleted my last post.. :angry

Here how does the ant have 3 choices after the second path..It again has 2 choices..
Also it misses all the complex paths that the ant visits not in 3 steps..say in 5 or 7 steps..(It is possible)

Either I misunderstood the Q and the E or the explanation is incorrect

I guess the way would be:
No of ways to do in-
3 steps: 3*2*1=6
5 steps: 3*2*1*1*1=6
7 steps: 3*2*1*1*1*1*1=6
No more steps are possible: total 18 ways

Experts please comment


Bumping for review...Karishma & Bunuel..please review the solution in view of the above approach I have posted


As for your solution, it is correct too, of course. You chose to split it into "number of paths used". But note the 1s you used in 5 steps and 7 steps. It means that paths are unique and the method involves some unnecessary counting. A cube gives us symmetry and it would be good to use that.
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An ant is clinging to one corner of a box in the shape of a   [#permalink] 16 Jul 2014, 21:00
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