mindruna
Just gettin' started!
Joined: 19 Mar 2007
Posts: 27
Thanks given: 0
Thanked 0 times in 0 posts
Location: Cambridge, MA
|
 Posted: Sun Aug 05, 2007 8:54 am Post subject: GMAT Prep |
 |
|
In a certain group of 10 members, 4 members teach only French and the rest teach only Spanish or German. If the group is to choose a 3 member committee which must have at least one French teacher, how many different committees are possible?
The official answer is 100.
I know that to determine the total possible number of committee combinations I would do the following:
10!/3!7! to get a total of 120 combinations. I don't know how to limit this number to include a French teacher in each group.
Thanks for your help in advance! |
|
