## A child received a gift of six different soccer team flags, including Liverpool and Arsenal. If he only has space in his

##### This topic has expert replies
Legendary Member
Posts: 1165
Joined: 14 Oct 2017
Followed by:3 members

### A child received a gift of six different soccer team flags, including Liverpool and Arsenal. If he only has space in his

by VJesus12 » Tue Sep 22, 2020 7:14 am

00:00

A

B

C

D

E

## Global Stats

A child received a gift of six different soccer team flags, including Liverpool and Arsenal. If he only has space in his bedroom to display four flags in a row, how many arrangements are possible if he cannot display the Liverpool and Arsenal flags at the same time?

A) 162
B) 216
C) 272
D) 360
E) 414

Source: Veritas Prep

### GMAT/MBA Expert

GMAT Instructor
Posts: 5549
Joined: 25 Apr 2015
Location: Los Angeles, CA
Thanked: 43 times
Followed by:24 members

### Re: A child received a gift of six different soccer team flags, including Liverpool and Arsenal. If he only has space in

by Scott@TargetTestPrep » Fri Sep 25, 2020 1:46 pm
VJesus12 wrote:
Tue Sep 22, 2020 7:14 am
A child received a gift of six different soccer team flags, including Liverpool and Arsenal. If he only has space in his bedroom to display four flags in a row, how many arrangements are possible if he cannot display the Liverpool and Arsenal flags at the same time?

A) 162
B) 216
C) 272
D) 360
E) 414

Solution:

We are given that a child received 6 different soccer team flags, including Liverpool and Arsenal. We need to determine the number of arrangements that are possible when the flags are displayed 4 at a time and the Arsenal and Liverpool flags are not displayed at the same time.

We can create the following equation:

Total number of ways to display the flags = (number of ways to display the flags when both the Arsenal and Liverpool flags are displayed together) + (number of ways to display the flags when the Arsenal and Liverpool flags are not displayed together).

Let’s first determine the total number of ways to display the 4 flags from a choice of 6 flags.

This is a permutation problem because the order in which the flags are displayed is important.

Number of ways to display the 4 flags from 6 flags = 6P4 = 6 x 5 x 4 x 3 = 360

Next, we can determine the number of ways to display the flags when both Arsenal and Liverpool are displayed. Since we know that the Arsenal and Liverpool flags are definitely selected, that leaves us with 4 flags for the 2 remaining spots, so there are 4C2 ways to select the two remaining flags, which equals (4 x 3)/2! = 6 ways. Finally, there are 4! ways to arrange those 4 flags, which equals 24 ways. Thus, there are 24 x 6 = 144 ways to select and arrange the flags in which both Arsenal and Liverpool are displayed.

Finally, there are 360 - 144 = 216 ways to select and arrange the 4 flags when Arsenal and Liverpool cannot be displayed at the same time.