How many ways can one move from A to B?

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Mom4MBA: Senior | Next Rank: 100 Posts; Posts: 90; Joined: Fri Jan 22, 2010 1:10 pmFollowed by: 4 members; Location: New Jersey; Thanked: 13 times; GMAT Score:640

by Mom4MBA » Sat Feb 20, 2010 11:14 am

This is a nice question you people can give it a try;

Answer : B

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Source: Beat The GMAT — Problem Solving | Sat Feb 20, 2010 11:14 am

shashank.ism: Legendary Member; Posts: 1022; Joined: Mon Jul 20, 2009 11:49 pmFollowed by: 2 members; Location: Gandhinagar; Thanked: 41 times

by shashank.ism » Sat Feb 20, 2010 11:19 am

Mom4MBA wrote:This is a nice question you people can give it a try;

Answer : B

Since one can only move up and right so total ways from A to P = 2

also for going from P to B without touching Q = 2
so total ways 2x2 =4

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shashank.ism: Legendary Member; Posts: 1022; Joined: Mon Jul 20, 2009 11:49 pmFollowed by: 2 members; Location: Gandhinagar; Thanked: 41 times

by shashank.ism » Sat Feb 20, 2010 11:26 am

This is the solution via diagram...

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gauravgundal: Master | Next Rank: 500 Posts; Posts: 199; Joined: Mon Apr 06, 2009 4:15 am; Location: India; Thanked: 13 times

by gauravgundal » Sat Feb 20, 2010 11:27 am

The answer is influenced by the word unique ways.
The Unique ways from A to P = 2
The Unique ways from P to B = 2
Total Four ways from A to B

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Mom4MBA: Senior | Next Rank: 100 Posts; Posts: 90; Joined: Fri Jan 22, 2010 1:10 pmFollowed by: 4 members; Location: New Jersey; Thanked: 13 times; GMAT Score:640

by Mom4MBA » Sat Feb 20, 2010 12:51 pm

Both the above methods are good

This is my way, by taking each case;

URUURR
URRRUU
RUUURR
RURRUU

4 cases

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shashank.ism: Legendary Member; Posts: 1022; Joined: Mon Jul 20, 2009 11:49 pmFollowed by: 2 members; Location: Gandhinagar; Thanked: 41 times

by shashank.ism » Sat Feb 20, 2010 12:56 pm

Mom4MBA wrote:Both the above methods are good

This is my way, by taking each case;

URUURR
URRRUU
RUUURR
RURRUU

4 cases

thanks ...your method is also nice..I just posted the pictorial form of it...Well this type of problem becomes cumbersome when there is a bigger mesh...

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Mom4MBA: Senior | Next Rank: 100 Posts; Posts: 90; Joined: Fri Jan 22, 2010 1:10 pmFollowed by: 4 members; Location: New Jersey; Thanked: 13 times; GMAT Score:640

by Mom4MBA » Sat Feb 20, 2010 6:15 pm

true

Stay focused

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