|
Author |
Message |
|
TAGS:
|
|
|
VP
Joined: 14 Sep 2005
Posts: 1001
Location: South Korea
Followers: 1
Kudos [?]:
10
[0], given: 0
|
There are 10 letters - A, B, C, D, E, F, G, H, I J What is [#permalink]
 24 Nov 2005, 05:32
Question Stats:
0% (00:00) correct
 0% (00:00) wrong based on 0 sessions
There are 10 letters - A, B, C, D, E, F, G, H, I J
What is the ratio of the number of 4-lettered code to the number of 5-lettered code?
(What I am curious is, do we have enough information to solve this question?)
_________________
Auge um Auge, Zahn um Zahn  !
|
|
|
|
|
|
|
SVP
Joined: 05 Apr 2005
Posts: 1745
Followers: 2
Kudos [?]:
17
[0], given: 0
|
yes, we have. use permutation, not combination because oder matters here.
so the ratio is = 10P4/10P5
|
|
|
|
|
|
Director
Joined: 24 Oct 2005
Posts: 666
Location: London
Followers: 1
Kudos [?]:
6
[0], given: 0
|
In these type of questions, do we assume that letters can be replaced or not replaced?
|
|
|
|
|
|
Current Student
Joined: 29 Jan 2005
Posts: 5289
Followers: 17
Kudos [?]:
91
[0], given: 0
|
We have to assume that the letters cannot be repeated because it didn`t say so in the problem.
10P4/10P5= 1/6
|
|
|
|
|
|
SVP
Joined: 05 Apr 2005
Posts: 1745
Followers: 2
Kudos [?]:
17
[0], given: 0
|
remgeo wrote: In these type of questions, do we assume that letters can be replaced or not replaced?
imo, repetition is not allowed, however we are not supposed to assume.
|
|
|
|
|
|
Director
Joined: 24 Oct 2005
Posts: 666
Location: London
Followers: 1
Kudos [?]:
6
[0], given: 0
|
Can someone tell me how this will change if letters could be repeated in the words?
|
|
|
|
|
|
Director
Joined: 13 Nov 2003
Posts: 811
Location: BULGARIA
Followers: 1
Kudos [?]:
6
[0], given: 0
|
without repetition it is (10x9x8x7)/(10x9x8x7x6)=1/6
with repetition it is 10^4/10^5=1/10
|
|
|
|
|
|
SVP
Joined: 05 Apr 2005
Posts: 1745
Followers: 2
Kudos [?]:
17
[0], given: 0
|
remgeo wrote: Can someone tell me how this will change if letters could be repeated in the words?
with repetition = (10x10x10x10)/(10x10x10x10x10) =1/10
|
|
|
|
|
|
VP
Joined: 14 Sep 2005
Posts: 1001
Location: South Korea
Followers: 1
Kudos [?]:
10
[0], given: 0
|
HIMALAYA wrote: yes, we have. use permutation, not combination because oder matters here.
so the ratio is = 10P4/10P5
Cool. Thanks for the explanation.
10P4/10P5 is the OA.
"Use permutation when order matters"...I'll keep that in mind.
Thanks again!
_________________
Auge um Auge, Zahn um Zahn !
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Similar topics |
Author |
Replies |
Last post |
|
Similar
Topics:
|
 |
|
|
Let a, b, c, d, e, f, g, h, I be positive integers from 1 to
|
rahulraao |
1 |
27 Oct 2005, 19:23 |
|
|
|
|
A, B, C, D, E, F, G, and H are all integers, listed in order
|
humans |
5 |
07 Jul 2006, 09:05 |
|
|
|
|
This one flummoxed me A, B, C, D, E, F, G, and H are
|
GMATT73 |
8 |
15 Nov 2006, 07:27 |
|
|
1
|
|
A, B, C, D, E, F, G, and H are all integers, listed in order
|
IgnitedMind |
5 |
23 Sep 2008, 08:47 |
|
|
|
|
What is the value of A/B if A/B = C/D = E/F = G/H ? I) E/F=3
|
netcaesar |
3 |
01 Sep 2009, 15:21 |
|
|
|
|
|
|
close
