document.write( "Question 230883: Given the integers from 1 to nine inclusive, how many ways can the sum 15 be obtained by taking them three at a time? Repitions are not allowed. \n" ); document.write( "
Algebra.Com's Answer #171015 by checkley77(12844) ![]() You can put this solution on YOUR website! 1-2-3-4-5-6-7-8-9 \n" ); document.write( "X---------X---X--=15 \n" ); document.write( "X-------X-------X=15 \n" ); document.write( "--X-------X-X----=15 \n" ); document.write( "--X-----X-----X--=15 \n" ); document.write( "--X---X---------X=15 \n" ); document.write( "----X---X---X----=15 \n" ); document.write( "----X-X-------X--=15 \n" ); document.write( "------X-X-X------=15 \n" ); document.write( " |