Find all School-related info fast with the new School-Specific MBA Forum

It is currently 20 Oct 2014, 03:28

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.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

How many digits are needed to write 20! in decimal notation?

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
GMAT Instructor
avatar
Joined: 04 Jul 2006
Posts: 1269
Location: Madrid
Followers: 23

Kudos [?]: 132 [0], given: 0

How many digits are needed to write 20! in decimal notation? [#permalink] New post 19 Sep 2006, 02:34
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
How many digits are needed to write 20! in decimal notation?

(A) 16 (B) 17 (C) 18 (D) 19 (E) 20
Director
Director
User avatar
Joined: 06 May 2006
Posts: 782
Followers: 3

Kudos [?]: 14 [0], given: 0

 [#permalink] New post 19 Sep 2006, 07:10
Yeah it is 19 (Checked on the calculator too :twisted: )

Dunno if the approach is correct.
10! is around 3.6mn => 7 digits.
20! will definitely have at least 14.
Then every number after 15 should add another factor of 10, so (+5) = 19?

Is this method correct?
  [#permalink] 19 Sep 2006, 07:10
    Similar topics Author Replies Last post
Similar
Topics:
3 How many digits will be there to the right of the decimal vinnik 3 13 Apr 2013, 00:44
What is the sum of digits in decimal notation of number bmwhype2 2 06 Nov 2007, 11:10
How many digits are needed to write 20! in decimal notation? kevincan 8 09 Jul 2006, 02:12
How many digits are needed to write 2^163^35^18 + 8^15 in kevincan 1 07 Jul 2006, 22:25
decimal notation mandy 1 17 Jun 2005, 16:23
Display posts from previous: Sort by

How many digits are needed to write 20! in decimal notation?

  Question banks Downloads My Bookmarks Reviews Important topics  


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

Powered by phpBB © phpBB Group and phpBB SEO

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®.