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winlinux
Joined: 16 Aug 2004Posts: 2
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Posted: Mon Aug 16, 2004 5:33 pm Post subject: Railway lines
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There are five towns no three of which lie on a straight line. They must be connected by a railway line composed of four straight tracks. Bridge crossings are permitted; the lines are supposed to have different levels at the crossing points.
How many different railway lines can be constructed?
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