document.write( "Question 1122854: Lili has 20 friends. Among them are Kevin and Gerry, who are husband and wife.
\n" );
document.write( "Lili wants to invite six of her friends to her birthday party. If neither Kevin nor
\n" );
document.write( "Gerry will go to a party without the other, how many choices does Lili have? \n" );
document.write( "
Algebra.Com's Answer #739046 by ikleyn(52814)![]() ![]() You can put this solution on YOUR website! .\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "If each separate \"choice\" is the group of 6 invited friends, then the solution is THIS :\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " \r\n" ); document.write( " the number of choices Lili has =\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "I assume that you are familiar with Combinations to that extent to calculate the numbers from the formula on your own.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "If not - then you have a good chance and a happy opportunity to learn about Combinations from introductory 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 \n" ); document.write( " \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 \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "The referred lessons are the part of this online textbook under the topic \"Combinatorics: Combinations and permutations\". \r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Save the link to this textbook together with its description\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Free of charge online textbook in ALGEBRA-II \n" ); document.write( "https://www.algebra.com/algebra/homework/complex/ALGEBRA-II-YOUR-ONLINE-TEXTBOOK.lesson\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "into your archive and use when it is needed.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |