Last visit was: 22 Apr 2026, 19:18 It is currently 22 Apr 2026, 19:18
Home
Messages
Tests
Schools
Events
Close
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel
User avatar
bagdbmba
User avatar
Retired Moderator
Joined: 27 Aug 2012
Last visit: 10 Dec 2021
Posts: 998
Own Kudos:
4,224
Given Kudos: 156
Posts: 998
Kudos: 4,224
A code signal uses digit-letter-digit combinations but 0 and 03 Feb 2013, 07:27
Kudos
Add Kudos
Bookmarks
Bookmark this Post
00:00
Start Timer
Pause Timer
Resume Timer
Show Answer
Hide
Show
History
N
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 4 sessions

History

Date
Time
Result
Not Attempted Yet
A code signal uses digit-letter-digit combinations but 0 and 1 are not used for either digits or letters.How many code signals are possible ?

(A) 1536
(B) 1456
(C) 1024
(D) 1628
(E) 856

Bunuel- can you please explain in detail ?

Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Problem Solving (PS) Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
User avatar
fameatop
User avatar
Joined: 24 Aug 2009
Last visit: 09 Jun 2017
Posts: 382
Own Kudos:
2,550
Given Kudos: 275
Concentration: Finance
Schools:Harvard, Columbia, Stern, Booth, LSB,
Posts: 382
Kudos: 2,550
A code signal uses digit-letter-digit combinations but 0 and Updated on: 03 Feb 2013, 10:36
Originally posted by fameatop on 03 Feb 2013, 10:10.
Last edited by fameatop on 03 Feb 2013, 10:36, edited 1 time in total.
Kudos
Add Kudos
Bookmarks
Bookmark this Post
debayan222
1. A code signal uses digit-letter-digit combinations but 0 and 1 are not used for either digits or letters.How many code signals are possible ?
(A) 1536
(B) 1456
(C) 1024
(D) 1628
(E) 856

Bunuel- can you please explain in detail ?
Show more

Places need to be filled (or the number of ways to form a 3 digit number if Digits or letters can be repeated) = D L D
Only 8 digits can be used to make a signal as 2 digits (0 & 1) are not allowed
Letters that can be used to make a signal = 26

Letter or digits can be used repeatedly as we have to form a code (3A3 is different from 3A1)
First place can be filled in = 8 ways
2nd place can be filled in = 26 ways
3rd place can be filled in = 8 ways

Total no of ways to form a code = 8 x 28 x 8 = 1664

I really doubt the language of this question. If the above options are correct, then question must state explicitly that DIGITS can be used only ONCE. In that case, answer would be 8 x 26 x 7=1456

Hope it helps.
User avatar
Vips0000
User avatar
Current Student
Joined: 15 Sep 2012
Last visit: 02 Feb 2016
Posts: 521
Own Kudos:
1,313
Given Kudos: 23
Status:Done with formalities.. and back..
Location: India
Concentration: Strategy, General Management
Schools: Olin - Wash U - Class of 2015
WE:Information Technology (Computer Software)
Products:
My Reviews
Schools: Olin - Wash U - Class of 2015
Posts: 521
Kudos: 1,313
A code signal uses digit-letter-digit combinations but 0 and 03 Feb 2013, 10:15
Kudos
Add Kudos
Bookmarks
Bookmark this Post
debayan222
1. A code signal uses digit-letter-digit combinations but 0 and 1 are not used for either digits or letters.How many code signals are possible ?

(A) 1536
(B) 1456
(C) 1024
(D) 1628
(E) 856

Bunuel- can you please explain in detail ?
Show more
What is the source of the question? How could 0 or 1 be used for letter anyway? Bad question..

Also, none of the answer choices is correct for the given question. Ans must be 8*26*8=1664

To top that, there is no OA.. Probably you should refer to posting rules...
User avatar
bagdbmba
User avatar
Retired Moderator
Joined: 27 Aug 2012
Last visit: 10 Dec 2021
Posts: 998
Own Kudos:
4,224
Given Kudos: 156
Posts: 998
Kudos: 4,224
A code signal uses digit-letter-digit combinations but 0 and Updated on: 03 Feb 2013, 10:49
Originally posted by bagdbmba on 03 Feb 2013, 10:48.
Last edited by bagdbmba on 03 Feb 2013, 10:49, edited 1 time in total.
Kudos
Add Kudos
Bookmarks
Bookmark this Post
fameatop-See my comments below in red...

fameatop
debayan222
1. A code signal uses digit-letter-digit combinations but 0 and 1 are not used for either digits or letters.How many code signals are possible ?
(A) 1536
(B) 1456
(C) 1024
(D) 1628
(E) 856

Bunuel- can you please explain in detail ?

Places need to be filled (or the number of ways to form a 3 digit number if Digits or letters can be repeated) = D L D
Only 8 digits can be used to make a signal as 2 digits (0 & 1) are not allowed
Letters that can be used to make a signal = 26

Letter or digits can be used repeatedly as we have to form a code (3A3 is different from 3A1)
First place can be filled in = 8 ways
2nd place can be filled in = 26 ways
3rd place can be filled in = 8 ways

Total no of ways to form a code = 8 x 26 x 8 = 1664

Yup..!if you're to consider repetition then it's the answer...but it doesn't say that explicitly..

I really doubt the language of this question. If the above options are correct, then question must state explicitly that DIGITS can be used only ONCE. In this case, answer will be 8 x 26 x 7=1456

You've very rightly said that the question is indeed ambiguous...Even I've had the this answer..

Hope it helps.
Show more
User avatar
bagdbmba
User avatar
Retired Moderator
Joined: 27 Aug 2012
Last visit: 10 Dec 2021
Posts: 998
Own Kudos:
4,224
Given Kudos: 156
Posts: 998
Kudos: 4,224
A code signal uses digit-letter-digit combinations but 0 and 03 Feb 2013, 10:49
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Vips0000
debayan222
1. A code signal uses digit-letter-digit combinations but 0 and 1 are not used for either digits or letters.How many code signals are possible ?

(A) 1536
(B) 1456
(C) 1024
(D) 1628
(E) 856

Bunuel- can you please explain in detail ?
What is the source of the question? How could 0 or 1 be used for letter anyway? Bad question..

Also, none of the answer choices is correct for the given question. Ans must be 8*26*8=1664

To top that, there is no OA.. Probably you should refer to posting rules...
Show more

Vips0000,
Question is indeed ambiguous..that's why I posted it here to get it clarified by 'the Master' himself-bunuel.

But,how can you be so sure that "Ans must be 8*26*8=1664" ?There is nothing mentioned about the repetition anywhere EXPLICITLY...

However,if there's any repetition then it's surely 1664.

Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Problem Solving (PS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
Moderator:
Bunuel
Math Expert
109754 posts