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March 2nd, 2010, 12:41 PM  #1 
Newbie Joined: Mar 2010 Posts: 1 Thanks: 0  Combinations/Permutations/multiplication problem
I desperately need help! I have a test tomorrow! Five boys and five girls stand in a line. a. How many arrangements are possible? b. How many arrangements are possible if the boys and girls stand alternately? 
March 2nd, 2010, 05:42 PM  #2  
Global Moderator Joined: May 2007 Posts: 6,770 Thanks: 700  Re: Combinations/Permutations/multiplication problem Quote:
a. 10! b slightly more complicate 5! each for boys and girls separately. 2 possibilities for first in line (boy or girl) Net result 2x5!x5!  

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