document.write( "Question 464107: 7 young girls are to be seated in a row. Calculate the number of different ways in which this can be done if 2 particular girls, Ushna and Manood, have exactly 3 of the other girls between them.\r
\n" );
document.write( "\n" );
document.write( "*Note: I know that the answer is this: (5C3) x (3!) x (3!) x (2!), but I can't understand how I get that. Please please explain this question in as much detail as possible as I cannot understand this topic. Please answer as soon as possible :) =) 卐 \n" );
document.write( "
Algebra.Com's Answer #317908 by sudhanshu_kmr(1152)![]() ![]() You can put this solution on YOUR website! \n" ); document.write( "To arrange them firstly find the number of ways to select 3 girls that will \n" ); document.write( "between Ushna and Manood. \r \n" ); document.write( "\n" ); document.write( "number of ways = 5C3 \r \n" ); document.write( "\n" ); document.write( "( select 3 girls out of 5 girls i.e except Ushna and Manood from total 7)\r \n" ); document.write( "\n" ); document.write( "number of ways to arrange these 3 girls = 3!\r \n" ); document.write( "\n" ); document.write( "number of ways to arrange ( 2 other girls + Ushna & Manood) = 3!\r \n" ); document.write( "\n" ); document.write( "i.e here Ushna & Manood is single entity.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "number of ways to arrange Ushna & Manood on their position = 2!\r \n" ); document.write( "\n" ); document.write( "i.e only interchange of their position.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "required number of ways = (5C3) x (3!) x (3!) x (2!)\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "If any doubt, you are welcome to get free help online: sudhanshu.cochin@gmail.com\r \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |