How many ways from A to D

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maihuna: Legendary Member; Posts: 1578; Joined: Sun Dec 28, 2008 1:49 amFollowed by: 9 members; Thanked: 82 times; GMAT Score:720

by maihuna » Tue Dec 08, 2009 6:03 am

There are bidirectional links from cities A to F in following way. Each city have connection to two cities. How many total connections are there.

Provide youw own answer.

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Source: Beat The GMAT — Problem Solving | Tue Dec 08, 2009 6:03 am

sunil_snath: Senior | Next Rank: 100 Posts; Posts: 39; Joined: Wed Nov 18, 2009 8:41 am; Thanked: 3 times

by sunil_snath » Tue Dec 08, 2009 8:54 am

Assuming cities are a, b,c,d,e,f, they will form a circlular connection.

So, 6 bidirectional links or 12 one directional links.

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maihuna: Legendary Member; Posts: 1578; Joined: Sun Dec 28, 2008 1:49 amFollowed by: 9 members; Thanked: 82 times; GMAT Score:720

by maihuna » Tue Dec 08, 2009 10:02 am

sunil_snath wrote:Assuming cities are a, b,c,d,e,f, they will form a circlular connection.

So, 6 bidirectional links or 12 one directional links.

I am not saying circular, by bidirectional I mean if there is a way from A to B it is also from B to A, and by two links from A I mean to two different cities let us say B and C. Hope I am clear.

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sunil_snath: Senior | Next Rank: 100 Posts; Posts: 39; Joined: Wed Nov 18, 2009 8:41 am; Thanked: 3 times

by sunil_snath » Wed Dec 09, 2009 12:33 am

so heres how that will map out:

B -------C ------- D
! !
! !
A--------E---------F

If every city is connected to the other 2, they will form a circle (or square or something like that...

lol). But then they will have 6 bi directional conections.

Cmon Maihuna, help me out of my misery here, tell me the answer...

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munaf: Junior | Next Rank: 30 Posts; Posts: 23; Joined: Mon Nov 16, 2009 12:51 am

by munaf » Wed Dec 09, 2009 12:52 am

IS THE ANSWER 6?

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maihuna: Legendary Member; Posts: 1578; Joined: Sun Dec 28, 2008 1:49 amFollowed by: 9 members; Thanked: 82 times; GMAT Score:720

by maihuna » Wed Dec 09, 2009 5:11 am

sunil_snath wrote:so heres how that will map out:

B -------C ------- D
! !
! !
A--------E---------F

If every city is connected to the other 2, they will form a circle (or square or something like that... lol). But then they will have 6 bi directional conections.

Cmon Maihuna, help me out of my misery here, tell me the answer...

Ok, let me just recheck it.

Charged up again to beat the beast

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