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April 11th, 2011, 07:12 AM   #1
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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
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April 11th, 2011, 11:15 AM   #2
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Re: Probability(combination)

Hello, hoyy1kolko!

Quote:
1.How many diagonals does an octagon have?













Quote:
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:

[color=beige]. . [/color]a) the 3 groups.

[color=beige] .[/color][color=red]**[/color]




Quote:
b) the 3 groups with 4 particular students who must be in group A.








~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

[color=red]**[/color]

If you are not familiar with Partitions, you can still reason out the answer.










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April 12th, 2011, 02:33 AM   #3
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Re: Probability(combination)

but the answer provided for question 2(b) is 27720.
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