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I am afraid, I need to relook at my explanation.
E.

There will be total: 2520 combinations for 4 teams.
However, we need to eliminate duplicate combinations.
For example, (1,2), (3,4), (5,6), (7,8) is same as (3,4),(1,2),(5,6),(7,8)
That is, order of teams not important. We, therefore, need to divide by 4! = 24

However, we need to eliminate duplicate combinations. For example, (1,2), (3,4), (5,6), (7,8) is same as (3,4),(1,2),(5,6),(7,8) That is, order of teams not important. We, therefore, need to divide by 4! = 24

Wow, great catch duttsit, I got 2520 too before realizing that I needed to divide by 24 to get 105.

Re: Ps: combination [#permalink]
01 Nov 2005, 22:34

gmacvik wrote:

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

Answer is E (8c2x6c2x4c2x2c2)/4! = 105

okay, going to bed. _________________

"Wow! Brazil is big." â€”George W. Bush, after being shown a map of Brazil by Brazilian president Luiz Inacio Lula da Silva, Brasilia, Brazil, Nov. 6, 2005

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