Last visit was: 11 Jul 2025, 05:30 It is currently 11 Jul 2025, 05:30
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.
Close
Request Expert Reply
Confirm Cancel
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 11 Jul 2025
Posts: 102,634
Own Kudos:
Given Kudos: 98,170
Products:
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 102,634
Kudos: 740,343
 [14]
Kudos
Add Kudos
14
Bookmarks
Bookmark this Post
User avatar
Kurtosis
User avatar
Current Student
Joined: 13 Apr 2015
Last visit: 10 Nov 2021
Posts: 1,400
Own Kudos:
4,976
 [2]
Given Kudos: 1,228
Location: India
Products:
Posts: 1,400
Kudos: 4,976
 [2]
2
Kudos
Add Kudos
Bookmarks
Bookmark this Post
avatar
manoela
Joined: 30 Oct 2018
Last visit: 13 Jan 2019
Posts: 1
Given Kudos: 3
Posts: 1
Kudos: 0
Kudos
Add Kudos
Bookmarks
Bookmark this Post
User avatar
arpitkansal
Joined: 17 Jun 2018
Last visit: 23 Aug 2021
Posts: 42
Own Kudos:
Given Kudos: 478
Location: Canada
Schools: IMD '20
GMAT 1: 690 Q48 V36
GPA: 2.84
WE:Engineering (Real Estate)
Schools: IMD '20
GMAT 1: 690 Q48 V36
Posts: 42
Kudos: 41
Kudos
Add Kudos
Bookmarks
Bookmark this Post
manoela
Question in b) I cannot have w=1 as a odd prime?

By definition a prime number is divisible only by itself and "1".
This does not apply to "1",so 1 is not considered a prime number.
User avatar
Rohit_842
Joined: 01 Feb 2024
Last visit: 11 Jul 2025
Posts: 111
Own Kudos:
Given Kudos: 104
Posts: 111
Kudos: 29
Kudos
Add Kudos
Bookmarks
Bookmark this Post
HarshavardhanR how do you even get 9 distinct odd primes all single digit? there are only 3!!
"each row and each column must be filled with distinct digits" what am I missing?
User avatar
HarshavardhanR
Joined: 16 Mar 2023
Last visit: 11 Jul 2025
Posts: 382
Own Kudos:
358
 [1]
Given Kudos: 55
Status:Independent GMAT Tutor
Affiliations: Ex - Director, Subject Matter Expertise at e-GMAT
Expert
Expert reply
Posts: 382
Kudos: 358
 [1]
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
[color=#0f0f0f]In the diagram above each of the letters represents an odd single-digit prime.

- There are only 3 odd single-digit primes: 3,5,7.
- So, each letter in the diagram is represented by either a 3 or a 5 or a 7.

If each row and each column must be filled with distinct digits

- Each row has distinct digits i.e., if you take any one row, there will be no repetition of digits.
- Each column has distinct digits i.e., if you take any one column, there will be no repetition of digits.

Here is one example ->
[/color]
735
573
357


Observe - each row, whether you take row 1 or row 2 or row 3 - has distinct digits (each row has 3, 5, and 7 - but no repeat of any digit).
Similarly, each column, whether you take column 1 or column 2 or column 3 - has distinct digits (each column has 3, 5, and 7 - but no repeat of any of the digits).

This is actually similar to a Sudoku Grid - every row and every column has distinct digits.

Hope this helps!

---
Harsha


Rohit_842
HarshavardhanR how do you even get 9 distinct odd primes all single digit? there are only 3!!
"each row and each column must be filled with distinct digits" what am I missing?
Moderator:
Math Expert
102634 posts