GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 18 Oct 2019, 06:37

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

17^27 has a units digit of: 1 2 3 7 9

  post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Manager
Manager
avatar
Joined: 21 Jun 2006
Posts: 232
17^27 has a units digit of: 1 2 3 7 9  [#permalink]

Show Tags

New post 26 Jun 2007, 21:43
2
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

100% (00:16) correct 0% (00:00) wrong based on 76 sessions

HideShow timer Statistics

17^27 has a units digit of:
1
2
3
7
9

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

THERE IS LIKELY A BETTER DISCUSSION OF THIS EXACT QUESTION.
This discussion does not meet community quality standards. 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.
Senior Manager
Senior Manager
avatar
Joined: 12 Jun 2006
Posts: 428
  [#permalink]

Show Tags

New post 26 Jun 2007, 21:57
1
my answer is 9.
units digit cycle is 7,9,3,1,7,9,3,1,7 etc. the 27th iteration is 9.
Senior Manager
Senior Manager
avatar
Joined: 04 Jun 2007
Posts: 272
Re: PS:Powers  [#permalink]

Show Tags

New post 26 Jun 2007, 22:36
1
Himalayan wrote:
ArvGMAT wrote:
17^27 has a units digit of:
1
2
3
7
9


3.


Agree with 3. It will be the third (remainder in 27/4) term.
Director
Director
User avatar
Joined: 14 Jan 2007
Posts: 600
  [#permalink]

Show Tags

New post 27 Jun 2007, 02:38
(17^4)^6 *17^3
Units digits = 1 * 3 = 3
Director
Director
avatar
Joined: 06 Sep 2006
Posts: 503
  [#permalink]

Show Tags

New post 27 Jun 2007, 09:41
Capturing only unit digits
7^1 = 7
7*7 = 9 (only unit digit)
9*7 = 3
3*7 = 1
1*7 = 7

So pattern repeat itself after 4 iteration.

7 9 3 1 7 9 3 1...

3. I think it is C.
Non-Human User
User avatar
Joined: 09 Sep 2013
Posts: 13257
Re: 17^27 has a units digit of: 1 2 3 7 9  [#permalink]

Show Tags

New post 13 Apr 2019, 04:36
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.
_________________
GMAT Club Bot
Re: 17^27 has a units digit of: 1 2 3 7 9   [#permalink] 13 Apr 2019, 04:36
Display posts from previous: Sort by

17^27 has a units digit of: 1 2 3 7 9

  post reply Question banks Downloads My Bookmarks Reviews Important topics  





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