Permutation and Combination

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naveenhv: Senior | Next Rank: 100 Posts; Posts: 41; Joined: Wed Dec 16, 2009 8:26 am; Thanked: 1 times

Permutation and Combination

by naveenhv » Fri May 06, 2011 9:40 am

What is the number of different committees of 4 people that can be selected from a group of 10 people?

a) 20

b) 40

c) 80

d) 120

e) 210

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Source: Beat The GMAT — Data Sufficiency | Fri May 06, 2011 9:40 am

pemdas: Legendary Member; Posts: 1084; Joined: Fri Apr 15, 2011 2:33 pm; Thanked: 158 times; Followed by:21 members

by pemdas » Fri May 06, 2011 9:49 am

C(10,4)=10!/(4!*6!)=210

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naveenhv wrote:What is the number of different committees of 4 people that can be selected from a group of 10 people?

a) 20

b) 40

c) 80

d) 120

e) 210

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