BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

combination

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Problem Solving |
Master | Next Rank: 500 Posts
Posts: 437
Joined: Sat Nov 22, 2008 5:06 am
Location: India
Thanked: 50 times
Followed by:1 members
GMAT Score:580

by beat_gmat_09 » Thu Dec 16, 2010 11:25 pm
2 Republicans can be selected from 4 Republicans in C(4,2) ways
3 Democrats can be selected from 5 Democrats in C(5,3)=C(5,2) ways
Total = number of ways of 2 selections * number of ways of 3 selections
= C(4,2)*C(5,2) = 6*10 = 60
Hope is the dream of a man awake
Top
Master | Next Rank: 500 Posts
Posts: 181
Joined: Sat Oct 16, 2010 1:57 pm
Thanked: 4 times

by N:Dure » Thu Dec 16, 2010 11:33 pm
I know beat_gmat replied but I've never solved a comb b4 so give me a break :-)

R : 4!/2!2! = 6
D : 5!/3! 2! = 10

R&D= 6*10 = 60
Top
Post new topic Post Reply
• Page 1 of 1