document.write( "Question 1187182: A road is built to connect each pair of cities. How many roads for 12 cities if each
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Algebra.Com's Answer #818115 by ikleyn(52781) $\"\"$ $\"About$

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document.write( "The number of roads =  = 66.\r\n" );
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document.write( "Each of 12 cities is connected with all other 11 cities,\r\n" );
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document.write( "and each road connects two cities.\r\n" );
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