Check GMAT Club Decision Tracker for the Latest School Decision Releases https://gmatclub.com/AppTrack

 It is currently 30 May 2017, 00:39

### 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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# if 4 d x d 12, is the tens digit of x! prime? 1) x is even

 post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
Manager
Joined: 04 Dec 2005
Posts: 81
Followers: 1

Kudos [?]: 23 [0], given: 0

if 4 d x d 12, is the tens digit of x! prime? 1) x is even [#permalink]

### Show Tags

18 Jun 2006, 18:21
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

### HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

if 4 d x d 12, is the tens digit of x! prime?

1) x is even
2) x! has exactly 3 distinct prime factors

I do not understand what does the question mean when it says 4 d x d 12 (Source: Princeton GMAT Test 2)

OA: B
Director
Joined: 06 May 2006
Posts: 791
Followers: 3

Kudos [?]: 34 [0], given: 2

### Show Tags

19 Jun 2006, 15:43
It is probably 4 < x < 12.

#1. x is even => x = 6, 8, 10. Insufficient
6! = 720 (tens digit prime)
8! = 40320 (tens digit prime)
10! = 3628800 (tens digit not prime)

#2. x! has exactly 3 distinct prime factors
5! = 1*2*3*4*5 (3 prime factors) = 120 (tens digit prime)
6! = 1*2*3*4*5*6 (3 prime factors) = 720 (tens digit prime)
7! = 1*2*3*4*5*6*7 (4 prime factors), and so on...
Sufficient

Hence answer is B.

Now to sleep - 4.20 am here...
_________________

Uh uh. I know what you're thinking. "Is the answer A, B, C, D or E?" Well to tell you the truth in all this excitement I kinda lost track myself. But you've gotta ask yourself one question: "Do I feel lucky?" Well, do ya, punk?

19 Jun 2006, 15:43
Display posts from previous: Sort by

# if 4 d x d 12, is the tens digit of x! prime? 1) x is even

 post reply Question banks Downloads My Bookmarks Reviews Important topics

 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®.