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PS-Combinations

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Senior Manager
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PS-Combinations [#permalink]

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New post 02 Dec 2008, 04:46
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A
B
C
D
E

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A group of 8 friends want to play doubles tennis. How many different ways can the group be divided into 4 teams of 2 people?

A. 420
B. 2520
C. 168
D. 90
E. 105

my solutions is 8c2*6c2*4c2*2c2= 2520. is it correct?
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Joined: 08 Oct 2007
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Re: PS-Combinations [#permalink]

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New post 02 Dec 2008, 07:11
I thik B is the answer

1) variations of 2 out of 8: 8*7/2=28
2) variations of 2 out of 6: 6*5/2=15
3) variations of 2 out 0f 4: 4*3/2=6
4) variations of 2 out of 2: 2*1/2=1

Combining: 1*6*15*28=2520
Re: PS-Combinations   [#permalink] 02 Dec 2008, 07:11
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