document.write( "Question 1114788: Hello, thank you for helping me with this math question
\n" );
document.write( "Consider a class with 12 girls and 10 boys (22 in total):
\n" );
document.write( "In how many ways can a committee of 5 consisting of 3 girls and 2 boys be chosen?
\n" );
document.write( "a) 0.03
\n" );
document.write( "b) 792
\n" );
document.write( "c) 0.3759
\n" );
document.write( "d) 9900
\n" );
document.write( "Here is my thought process which led to none of the given answer choices.
\n" );
document.write( "We can easily eliminate A and C, as they are not numbers of different arrangements, rather, they are probabilities, which is not what the question is asking.
\n" );
document.write( "I recognized the nature of the question to be a permutation, as you care about which order you are placing the 12 girls in 3 places on the committee. For example, Girl A, B, C is a possible permutation, but B, A, C is also a different permutation that must be counted. The same is true for putting the 10 boys into the 2 other spaces on the committee. So, I tried (12 nPr 3) + (10 nPr 2), which made logical sense in my head as you want 12 girls in 3 different ways on the committee plus the 10 boys you want in 3 different ways on the committee.
\n" );
document.write( "This way gets you to an answer of 1410, which is way off from the answer choices,so I was wondering what I did wrong in this thought process.
\n" );
document.write( "Thank you for your time and free advice :)
\n" );
document.write( " \n" );
document.write( "
Algebra.Com's Answer #729706 by ikleyn(52798)![]() ![]() You can put this solution on YOUR website! . \n" ); document.write( "For Combinations, see 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( " - OVERVIEW of lessons on Permutations and 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( " |