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Titleist
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David is putting together a golf charity outing. He has 30 Dec 2003, 22:52
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David is putting together a golf charity outing. He has invited 11 other people and will have to put together 3 foursomes (Group 1, Group 2, Group 3) - one of which he will choose randomly before putting together the rosters. In this group of 11 people are Jacob and Esau. If Jacob and David must be in the same foursome and if Esau cannot be in the same foursome as Jacob (not because he stole Esau's birthright but because Jacob is a slowarse golfer) then how many distinct combination of 3 foursomes can David put together?



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David is putting together a golf charity outing. He has 30 Dec 2003, 23:30
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Goodness! It's frigg'n 1:30 in the morning - and I'm up writing frigg'n gmat questions - I need counseling! :beat
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Is it ?

9C2 * 8C4 * 4C4 = 2520
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Paul
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David is putting together a golf charity outing. He has 30 Dec 2003, 23:45
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Did you edit this question? it seemed like I first read "invited 23 other people" instead of 11... I'll give it a harder look tomorrow. gn
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Geethu,

I put down groups 1,2, and 3 as distinct groups. So he chooses to be part of 1 out of the 3 groups first - randomly. Thus 3C1(9C2*8C4*4C4)=7,560. Does this make sense?

Paul, sorry I did edit the question - putting 23 people down would've been too time consuming. Sorry to keep you up!

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David is putting together a golf charity outing. He has Updated on: 31 Dec 2003, 12:46
Originally posted by Praetorian on 31 Dec 2003, 00:08.
Last edited by Praetorian on 31 Dec 2003, 12:46, edited 1 time in total.
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Titleist
David is putting together a golf charity outing. He has invited 11 other people and will have to put together 3 foursomes (Group 1, Group 2, Group 3) - one of which he will choose randomly before putting together the rosters. In this group of 11 people are Jacob and Esau. If Jacob and David must be in the same foursome and if Esau cannot be in the same foursome as Jacob (not because he stole Esau's birthright but because Jacob is a slowarse golfer) then how many distinct combination of 3 foursomes can David put together?


EDIT : answer changed

lets say a tentative arrangement looks like this.

GROUP1 - Jacob , David , A ,B
GROUP2- Esau, B ,C,D
GROUP3- No restriction


Two people in group1 can be selected in 9C2 = 36 ways
Three people can be selected in group2 in 7C3 = 35 ways
Four people can be selected in group3 in 4C4 ways =1 ways

Total = 36 * 35 = 1260 ways

each of the these ways result in different groups

answer 1260?
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David is putting together a golf charity outing. He has 31 Dec 2003, 00:24
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Titleist
Geethu,

I put down groups 1,2, and 3 as distinct groups. So he chooses to be part of 1 out of the 3 groups first - randomly. Thus 3C1(9C2*8C4*4C4)=7,560. Does this make sense?

Paul, sorry I did edit the question - putting 23 people down would've been too time consuming. Sorry to keep you up!

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could you explain your solution?
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David is putting together a golf charity outing. He has 31 Dec 2003, 07:52
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Holy Cow,

Last time I write problems 1:30 in the morning! Kudos Praetorian! I stand corrected. This is the second time in history that Esau has been slighted!


(hold up on the answer! i'm looking it through!)
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David is putting together a golf charity outing. He has 31 Dec 2003, 08:05
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Sorry Praetorian!

I came up with a different solution

There's 3C1 ways David can choose a group

For Group 1 (assume David and Jacob are in this Group): (you must take Esau out of the mix; thus it's 8C2) =28

Group 2 (Put Esau back into the mix - no restriction: thus, 8C4)= 70

Group 3 (there are only 3 groups! no restriction: Thus 4C4) = 1

3*28*70*1=5,880


anyone with a different solution?
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David is putting together a golf charity outing. He has 31 Dec 2003, 08:26
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praetorian123
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David is putting together a golf charity outing. He has invited 11 other people and will have to put together 3 foursomes (Group 1, Group 2, Group 3) - one of which he will choose randomly before putting together the rosters. In this group of 11 people are Jacob and Esau. If Jacob and David must be in the same foursome and if Esau cannot be in the same foursome as Jacob (not because he stole Esau's birthright but because Jacob is a slowarse golfer) then how many distinct combination of 3 foursomes can David put together?

lets say a tentative arrangement looks like this.

GROUP1 - Jacob , David , A
GROUP2- Esau, B ,C
GROUP3- No restriction
Group 4 - No restriction


the third person in group1 can be selected in 9C1 = 9 ways
two people can be selected in group2 in 8C2 = 28 ways
three people can be selected in group3 in 6c3 ways =20 ways
three people can be selected in group4 in 3c3 = 1 way

Total = 9 * 28 * 20 * 1 = 5040 ways

each of the these ways result in different groups

answer 5040?


The problem says three groups with 4 people.
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Geethu
praetorian123
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David is putting together a golf charity outing. He has invited 11 other people and will have to put together 3 foursomes (Group 1, Group 2, Group 3) - one of which he will choose randomly before putting together the rosters. In this group of 11 people are Jacob and Esau. If Jacob and David must be in the same foursome and if Esau cannot be in the same foursome as Jacob (not because he stole Esau's birthright but because Jacob is a slowarse golfer) then how many distinct combination of 3 foursomes can David put together?

lets say a tentative arrangement looks like this.

GROUP1 - Jacob , David , A
GROUP2- Esau, B ,C
GROUP3- No restriction
Group 4 - No restriction


the third person in group1 can be selected in 9C1 = 9 ways
two people can be selected in group2 in 8C2 = 28 ways
three people can be selected in group3 in 6c3 ways =20 ways
three people can be selected in group4 in 3c3 = 1 way

Total = 9 * 28 * 20 * 1 = 5040 ways

each of the these ways result in different groups

answer 5040?

The problem says three groups with 4 people.


Yes the question does state three groups with 4 people.



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