Events & Promotions
|
|
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
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
May 2808:30 AM PDT
-09:30 AM PDT
Are you constantly rereading GMAT RC passages but still struggling to understand them? Most students think rereading improves accuracy — but in reality, it usually signals a flawed reading strategy.
May 2110:00 AM EDT
-11:59 PM EDT
Make the most of your break with the most realistic GMAT™ prep. Take up to $700 off select products.- May 27
08:30 AM PDT
-09:30 AM PDT
Next - GMAT Ninja CR series, we tackle a very specific flavor of Critical Reasoning: Plans & Goals questions. The GMAT loves to present a scenario where a company, government, or individual proposes a seemingly brilliant plan to achieve a specific goal. - Jun 10
06:00 AM PDT
-06:15 PM PDT
Register for the GMAT Club Virtual MBA Spotlight Fair – the world’s premier event for serious MBA candidates. This is your chance to hear directly from Admissions Directors at nearly every Top 30 MBA program..
23 Dec 2004, 04:37
Kudos
Bookmarks
Folks,
Is there a well-tested way to check if a large number like 73211 is odd and prime?Based on the number,I was able to determine that it was not divisble by the following numbers:
2-The last digit of 73211 is not 2
3 --As the sum of the digits of 73211 add to 5
5 -- As the last digit is not 0 nor 5
++++
But it was divisble by 7 in the following fashion:
7 -- 73211- [70000(7*10000) - 2800(7*400) - 411(7*137)]
+++++
Thus the above verifies that it is odd but nor prime number.
Is this the only way to check this?Is there a shorter method?[/b]
Is there a well-tested way to check if a large number like 73211 is odd and prime?Based on the number,I was able to determine that it was not divisble by the following numbers:
2-The last digit of 73211 is not 2
3 --As the sum of the digits of 73211 add to 5
5 -- As the last digit is not 0 nor 5
++++
But it was divisble by 7 in the following fashion:
7 -- 73211- [70000(7*10000) - 2800(7*400) - 411(7*137)]
+++++
Thus the above verifies that it is odd but nor prime number.
Is this the only way to check this?Is there a shorter method?[/b]
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 Quantitative Questions 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!
24 Dec 2004, 14:25
Kudos
Bookmarks
I think you did a pretty good job of checking. I mean, you know because it's an odd number that it's not divisible by 4 or 6, so 7 is the likely one to check.
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 Quantitative Questions 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!
