document.write( "Question 1083912: The no. Of straight line obtained by joinong 16 points on a plane, no thrice of them being on the same line is \n" ); document.write( "

Algebra.Com's Answer #697972 by ikleyn(52788) $\"\"$ $\"About$

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\n" ); document.write( "The no. Of straight $\"highlight%28cross%28line%29%29\"$ lines obtained by joining 16 points on a plane, no $\"highlight%28cross%28thrice%29%29\"$ three of them being on the same line is
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document.write( "=  =  = 120. \r\n" );
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document.write( "= the number of combinations of 16 points taken 2 at a time.\r\n" );
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\n" ); document.write( "\n" ); document.write( "On combinations, read the lessons\r
\n" ); document.write( "\n" ); document.write( "    - Introduction to Combinations\r
\n" ); document.write( "\n" ); document.write( "    - PROOF of the formula on the number of Combinations\r
\n" ); document.write( "\n" ); document.write( "    - Problems on Combinations (*)\r
\n" ); document.write( "\n" ); document.write( "in this site.\r
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\n" ); document.write( "\n" ); document.write( "By the way, in the lesson marked (*) you will find similar solved problem for planes in 3D . . . \r
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\n" ); document.write( "\n" ); document.write( "Also, you have this free of charge online textbook in ALGEBRA-II in this site\r
\n" ); document.write( "\n" ); document.write( "    - ALGEBRA-II - YOUR ONLINE TEXTBOOK.\r
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\n" ); document.write( "\n" ); document.write( "The referred lessons are the part of this online textbook under the topic \"Combinatorics: Combinations and permutations\". \r
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