GMAT Changed on April 16th - Read about the latest changes here

It is currently 25 May 2018, 04:12

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

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

What is the units digit of (13)^4(17)^2(29)^3? (A) 9 (B) 7

  post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Intern
Intern
avatar
Joined: 30 Mar 2006
Posts: 26
Location: New Jersey
What is the units digit of (13)^4(17)^2(29)^3? (A) 9 (B) 7 [#permalink]

Show Tags

New post 07 Apr 2006, 05:54
2
This post was
BOOKMARKED
What is the units digit of (13)^4(17)^2(29)^3?

(A) 9

(B) 7

(C) 5

(D) 3

(E) 1

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

_________________

Andre Crompton
andre.crompton@cit.com

Director
Director
User avatar
Joined: 06 Feb 2006
Posts: 885
 [#permalink]

Show Tags

New post 07 Apr 2006, 06:06
Answer E...

3*3*3*3= units digit 1

7*7= units digit 9

9*9*9= units digit 9

So....

9*9*1= units digit 1.
GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jul 2004
Posts: 4982
Location: Singapore
 [#permalink]

Show Tags

New post 07 Apr 2006, 06:11
3^4 = 81
7^2 = 49
9^3 = 729

Units digit = 1*9*9 = 1
Manager
Manager
avatar
Joined: 25 Mar 2006
Posts: 125
Location: Stonybrook Univ
 [#permalink]

Show Tags

New post 07 Apr 2006, 06:59
clever ! thanks guys :) good thing to know. i had a question like this, took me a little while to do it my own ( not soo clever ) way

if lets say you had 2 find the 10's or 100's digit how would you do it ? would the same pattern work ?
Senior Manager
Senior Manager
avatar
Joined: 29 Jun 2005
Posts: 398
 [#permalink]

Show Tags

New post 07 Apr 2006, 09:26
NTLancer wrote:
if lets say you had 2 find the 10's or 100's digit how would you do it ? would the same pattern work ?


Yes, it all depends on the number. You just have to learn the cycle
for example:
7^100 -
7^2 -.9
7^3 -.3
7^4 -.1
7^5 -.7
------
See the pattern, 7^..5 always has 7 unit digit.
7^10 -.7
------
7^50 -.7
------
7^100 -.7
Non-Human User
User avatar
Joined: 09 Sep 2013
Posts: 6853
Premium Member
Re: What is the units digit of (13)^4(17)^2(29)^3? (A) 9 (B) 7 [#permalink]

Show Tags

New post 15 Nov 2017, 06:25
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

_________________

GMAT Books | GMAT Club Tests | Best Prices on GMAT Courses | GMAT Mobile App | Math Resources | Verbal Resources

Re: What is the units digit of (13)^4(17)^2(29)^3? (A) 9 (B) 7   [#permalink] 15 Nov 2017, 06:25
Display posts from previous: Sort by

What is the units digit of (13)^4(17)^2(29)^3? (A) 9 (B) 7

  post reply Question banks Downloads My Bookmarks Reviews Important topics  

Moderator: chetan2u



GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.