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April 11th, 2011, 07:12 AM  #1 
Senior Member Joined: Dec 2010 Posts: 233 Thanks: 0  Probability(combination)
1.How many diagonals does an octagon have? 2.16 students are divided into 3 groups,with group A having 9 students,group B having 4 students with the rest in group C.Calculate the number of ways to form a)the 3 groups b)the 3 groups with 4 particular students who must be in group A I don get it how question 1 relate to combination.please help me and question 2 too.thx 
April 11th, 2011, 11:15 AM  #2  
Math Team Joined: Dec 2006 From: Lexington, MA Posts: 3,267 Thanks: 407  Re: Probability(combination) Hello, hoyy1kolko! Quote:
Quote:
[color=beige] .[/color][color=red]**[/color] Quote:
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ [color=red]**[/color] If you are not familiar with Partitions, you can still reason out the answer.  
April 12th, 2011, 02:33 AM  #3 
Senior Member Joined: Dec 2010 Posts: 233 Thanks: 0  Re: Probability(combination)
but the answer provided for question 2(b) is 27720.


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