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

 It is currently 04 Jul 2015, 23:48

### 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

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

# 0 a multiple of all numbers???

Author Message
TAGS:
Intern
Joined: 29 Aug 2004
Posts: 4
Followers: 0

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

0 a multiple of all numbers??? [#permalink]  01 Oct 2004, 23:07
On another site, the answer to the following Data Sufficiency:

X is a prime number. What is X?

(1) X <15

(2) (X-2) is a multiple of 5

The answer purported to be E, because X could be 2 or 7, given that 5 and 0 are multiples of 5 (i.e. each 5 and 0 can be divided by 5 evenly).

This just seems wrong - that 0 is a multiple of all numbers - but wanted to sanity check this with a considerably more sophisticated site than the one I happenned to be on when I ran across this.
Director
Joined: 16 Jun 2004
Posts: 893
Followers: 2

Kudos [?]: 27 [0], given: 0

1. X is a prime number < than 15. It can be 2,3,5,7,11,or 13. Diff possible values for X. Hence Insuff.
2. X-2 = multiple of 5 => cn be 5, 10, 15, 20, 25...whatever. Now, say X-2 = 5 => X=3. say, X-2 = 10 => X=12. Different values for X. Hence Insufficient.

Combining both we have. X=3 prime number or say, X=12 not a prime number. Again many different values for X. Hence Insufficient. Hence E.
Manager
Joined: 24 Aug 2004
Posts: 66
Followers: 1

Kudos [?]: 4 [0], given: 0

I agree with the fact that 0 is the multiple of all numbers.
So, from stmt 1 alone: X= 2, 3, 5, 7, 11, 13 : insufficient.

from stmt 2 alone: X= 2, 7, 17, 37..... insufficient

combining to two: it is 2 and 7. So again insufficient.

Hence E.
Manager
Joined: 24 Aug 2004
Posts: 66
Followers: 1

Kudos [?]: 4 [0], given: 0

From venksune:
Quote:
X-2 = 5 => X=3.

Hope you dont do silly mistakes like these in actual gmat, x-2=5 => x= 7 and not 3.
Director
Joined: 16 Jun 2004
Posts: 893
Followers: 2

Kudos [?]: 27 [0], given: 0

Target780,
Thanks for pointing such mistakes. I always do such mistakes and seem to never learn.
CEO
Joined: 15 Aug 2003
Posts: 3467
Followers: 61

Kudos [?]: 718 [0], given: 781

as simple as the mistake is, how about this one for the error log venksune? you may want to write down a strategy to avoid this error next time.

thanks
Praet
Director
Joined: 16 Jun 2004
Posts: 893
Followers: 2

Kudos [?]: 27 [0], given: 0

Thanks Praet. Silly mistakes have costed me time and again - god help me. I will put in the error log. Its fortunate that the answer I derived is still right.

Thanks guys for the concern on me. It helps.
Manager
Joined: 26 Sep 2004
Posts: 137
Followers: 1

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

It happens and must be avoided. These silly mistakes scare the hell out me as well.
_________________

Franky
http://franky4gmat.blogspot.com

Similar topics Replies Last post
Similar
Topics:
7 Is 0 (zero) to be considered as a multiple of every number? 9 03 Nov 2010, 05:45
is 0 divisible by all the numbers?? 1 09 Feb 2009, 23:27
Number properties - is 0 a multiple of every integer? 5 30 Sep 2008, 22:06
Would you consider 0 to be a multiple of a number z? The 0 01 Aug 2007, 22:49
Is 0 considered to be a multiple of all numbers? Thanks 2 08 Feb 2007, 12:50
Display posts from previous: Sort by