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January 7th, 2014, 05:17 AM   #1
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Counting problem



The figure shows a network of roads from A to B. Ann goes from A to B either east or north at each junction. How many routes from A to B can Ann choose?
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January 7th, 2014, 06:09 AM   #2
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Re: Counting problem

Haha, I suddenly figured out it should be 7C4.
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January 7th, 2014, 10:01 AM   #3
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Re: Counting problem

Indeed it should.
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