mathcounts problem 48

Mathematics
Tutor: None Selected Time limit: 1 Day

There are 13 stations along Chesire Railroad,which runs in a straight line from east to west.A "trip" is defined by its starting and ending stations(regardless of intermediate stops)and must always go westward.How many different trips are possible?

Dec 28th, 2014

starting station cannot be an ending station

second station will be the first ending station making the trips to be 12

Dec 28th, 2014

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Dec 28th, 2014
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Dec 28th, 2014
Dec 3rd, 2016
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