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Here is an easy one to refresh your memory of Comb/Perm.

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VP
Joined: 06 Jun 2004
Posts: 1053
Location: CA
Here is an easy one to refresh your memory of Comb/Perm.  [#permalink]

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04 Feb 2006, 23:29
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Here is an easy one to refresh your memory of Comb/Perm.

Of a total of 10 teachers, 6 teach French, others teach Spanish and Chinese. If 3 teachers are to be selected for a committee including at least one French teacher, how many such committees are possible?
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Don't be afraid to take a flying leap of faith.. If you risk nothing, than you gain nothing...

VP
Joined: 21 Sep 2003
Posts: 1057
Location: USA

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04 Feb 2006, 23:36
116?

All combos - No French teacher
10C3 - 4C3 = 116
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"To dream anything that you want to dream, that is the beauty of the human mind. To do anything that you want to do, that is the strength of the human will. To trust yourself, to test your limits, that is the courage to succeed."

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Senior Manager
Joined: 05 Jan 2006
Posts: 381

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05 Feb 2006, 00:48
F for French X for other

FXX + FFX + FFF

C(6,1)*C(4,2) + C(6,2)*C(4,1) + C(6,3)
36+60+20 = 116

easy but multiplication and addition will make it 1.30+ min question...
Intern
Joined: 31 May 2005
Posts: 12

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06 Jun 2006, 18:38

Can someone explain.

thanks
Director
Joined: 10 Oct 2005
Posts: 718

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06 Jun 2006, 21:42
nshankaran wrote:

Can someone explain.

thanks

Maybe some typo in GMATPREP?
It should be 116
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IE IMBA 2010

06 Jun 2006, 21:42
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