How many zeros are the end of ? : GMAT Problem Solving (PS)
Check GMAT Club App Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

It is currently 10 Dec 2016, 12:06
GMAT Club Tests

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

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

How many zeros are the end of ?

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Senior Manager
Senior Manager
User avatar
Joined: 03 Sep 2012
Posts: 338
Location: United States
Concentration: Healthcare, Strategy
GMAT 1: 730 Q48 V42
GPA: 3.88
WE: Medicine and Health (Health Care)
Followers: 16

Kudos [?]: 175 [0], given: 31

How many zeros are the end of ? [#permalink]

Show Tags

New post 15 Nov 2012, 06:23
12
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

71% (01:51) correct 29% (00:45) wrong based on 888 sessions

HideShow timer Statistics

How many zeros are at the end of 380! ?

(A) 90
(B) 91
(C) 94
(D) None
(E) 95

[Reveal] Spoiler:
In order to find the number of zeros we have to find out the number of 5's and 2's , because no. of 5's will be less then the number of 2's ..
[Reveal] Spoiler: OA

_________________

"When you want to succeed as bad as you want to breathe, then you’ll be successful.” - Eric Thomas

Expert Post
2 KUDOS received
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 35950
Followers: 6863

Kudos [?]: 90116 [2] , given: 10418

How many zeros are the end of ? [#permalink]

Show Tags

New post 15 Nov 2012, 06:41
2
This post received
KUDOS
Expert's post
2
This post was
BOOKMARKED
vomhorizon wrote:
How many zeros are the end of 380! ?

(A) 90
(B) 91
(C) 94
(D) None
(E) 95


380! has \(\frac{380}{5}+\frac{380}{5^2}+\frac{380}{5^3}=76+15+3=94\) trailing zeros ( take only the quotient into account).

Answer: C.

For more on trailing zeros check: everything-about-factorials-on-the-gmat-85592.html

Similar questions to practice:
if-60-is-written-out-as-an-integer-with-how-many-101752.html
how-many-zeros-does-100-end-with-100599.html
find-the-number-of-trailing-zeros-in-the-expansion-of-108249.html
find-the-number-of-trailing-zeros-in-the-product-of-108248.html
if-n-is-the-product-of-all-multiples-of-3-between-1-and-101187.html
if-m-is-the-product-of-all-integers-from-1-to-40-inclusive-108971.html
if-p-is-a-natural-number-and-p-ends-with-y-trailing-zeros-108251.html
if-10-2-5-2-is-divisible-by-10-n-what-is-the-greatest-106060.html
p-and-q-are-integers-if-p-is-divisible-by-10-q-and-cannot-109038.html
question-about-p-prime-in-to-n-factorial-108086.html
if-n-is-the-product-of-integers-from-1-to-20-inclusive-106289.html
what-is-the-greatest-value-of-m-such-that-4-m-is-a-factor-of-105746.html
if-d-is-a-positive-integer-and-f-is-the-product-of-the-first-126692.html
if-10-2-5-2-is-divisible-by-10-n-what-is-the-greatest-106060.html

Hope it helps.
_________________

New to the Math Forum?
Please read this: All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 09 Sep 2013
Posts: 12907
Followers: 563

Kudos [?]: 158 [0], given: 0

Premium Member
Re: How many zeros are the end of ? [#permalink]

Show Tags

New post 25 Jul 2014, 10:54
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 Books | GMAT Club Tests | Best Prices on GMAT Courses | GMAT Mobile App | Math Resources | Verbal Resources

GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 09 Sep 2013
Posts: 12907
Followers: 563

Kudos [?]: 158 [0], given: 0

Premium Member
Re: How many zeros are the end of ? [#permalink]

Show Tags

New post 30 Aug 2015, 14:14
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 Books | GMAT Club Tests | Best Prices on GMAT Courses | GMAT Mobile App | Math Resources | Verbal Resources

Intern
Intern
avatar
Joined: 26 Jul 2016
Posts: 33
Location: India
Concentration: Operations, Entrepreneurship
Schools: Tepper '19
GPA: 3.69
WE: Analyst (Manufacturing)
Followers: 1

Kudos [?]: 0 [0], given: 10

Re: How many zeros are the end of ? [#permalink]

Show Tags

New post 06 Oct 2016, 11:27
Bunuel wrote:



HELLO BUNNEL, THERE WAS A FORMULA I SAW ON GMATCLUB FORUM IN WHICH TRAILING ZEROS COULD BE CALCULATED BY INCREASING THE POWERS ON INDIVIDUAL FACTORS OF A NUMBER . FOR EG 100! = 100= 2*2*5*5 = 2^2 + 5^2 NOW WE WILL INCREASE THE POWER BY ONE I.E. 2^3 +5^3 = NOW ADDING THE POWERS = 6 , PERHAPS SOMETHING ON SIMILAR LINES CAN YOU EXPLAIN TO ME THAT CONCEPT?
Re: How many zeros are the end of ?   [#permalink] 06 Oct 2016, 11:27
    Similar topics Author Replies Last post
Similar
Topics:
1 Experts publish their posts in the topic How many consecutive zeros will appear at the end of 43! if that numbe SW4 4 02 Dec 2016, 13:09
3 Experts publish their posts in the topic How many zeroes are there at the end of the number N, if N = 100! + 20 aayushagrawal 2 08 Jun 2016, 09:50
2 How many zeros does 135^19 x 42^17 end with? salsal 4 07 Sep 2013, 02:56
14 Experts publish their posts in the topic If 73! has 16 zeroes at the end, how many zeroes will 80! emmak 7 15 Feb 2013, 11:24
70 Experts publish their posts in the topic How many zeros does 100! end with? AndreG 19 07 Sep 2010, 12:41
Display posts from previous: Sort by

How many zeros are the end of ?

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| 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®.