document.write( "Question 127037: If there are 20 people in a room, and each person shakes hands with everyone exactly once, how many handshakes will there be?\r
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document.write( "Thanks for the help. \n" );
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Algebra.Com's Answer #93056 by stanbon(75887)![]() ![]() ![]() You can put this solution on YOUR website! 19C2 = 19*18/1*2 = 19*9 = 171 \n" ); document.write( "------------ \n" ); document.write( "You can see this pattern if you try it with \n" ); document.write( "2 people = 2C2 = 1 handshake \n" ); document.write( "3 people = 3C2 = 3 handshakes \n" ); document.write( "4 people = 4C2 = 6 handshakes \n" ); document.write( "5 people = 5C2 = 10handshakes \n" ); document.write( "etc. \n" ); document.write( "----------- \n" ); document.write( "Cheers, \n" ); document.write( "Stan H. \n" ); document.write( " |