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

Redeem

the following Saturday night

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
User avatar
GMAT Instructor
Posts: 3650
Joined: Wed Jan 21, 2009 4:27 am
Location: India
Thanked: 267 times
Followed by:80 members
GMAT Score:760

the following Saturday night

by sanju09 » Fri May 07, 2010 5:04 am
The organizers of a week-long fair have hired exactly five security guards to patrol the fairgrounds at night for the duration of the event. Exactly two guards are assigned to patrol the grounds every night, with no guard assigned consecutive nights. If the fair begins on a Monday, how many different pairs of guards will be available to patrol the fairgrounds on the following Saturday night?
(A) 2
(B) 3
(C) 5
(D) 6
(E) 7
The mind is everything. What you think you become. -Lord Buddha



Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com
Top
Source: — Problem Solving |
User avatar
Master | Next Rank: 500 Posts
Posts: 170
Joined: Wed Jun 10, 2009 5:59 am
Thanked: 13 times

by iamseer » Fri May 07, 2010 10:02 am
IMO B
"Choose to chance the rapids and dance the tides"
Top
Master | Next Rank: 500 Posts
Posts: 140
Joined: Fri Feb 05, 2010 2:43 pm
Thanked: 3 times
GMAT Score:720

by analyst218 » Fri May 07, 2010 10:12 am
sanju09 wrote:The organizers of a week-long fair have hired exactly five security guards to patrol the fairgrounds at night for the duration of the event. Exactly two guards are assigned to patrol the grounds every night, with no guard assigned consecutive nights. If the fair begins on a Monday, how many different pairs of guards will be available to patrol the fairgrounds on the following Saturday night?
(A) 2
(B) 3
(C) 5
(D) 6
(E) 7
+1 for B too.
every day starting tuesday you have 3 guards going for the two spots. combination 3C2=3
Top
Legendary Member
Posts: 759
Joined: Mon Apr 26, 2010 10:15 am
Thanked: 85 times
Followed by:3 members

by clock60 » Fri May 07, 2010 10:53 am
also got B
if x1,x2,x3,x4,x5 are persons for patrolling
say for monday the given pair is (x1,x2), then for the next day we have x3,x4,x5 from with we have 3C2=3 pairs (x3 x4, x3 x5, x4 x5), let it be x3 x4, and for the following day we have 3 persons to chose from x1,x2,x5 and again 3 pairs
Top
Post new topic Post Reply
• Page 1 of 1