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.

It appears that you are browsing the GMAT Club forum unregistered!

Signing up is free, quick, and confidential.
Join other 500,000 members and get the full benefits of GMAT Club

Registration gives you:

Tests

Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.

Applicant Stats

View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more

Books/Downloads

Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

Re: If X is divisible by 2,6,9,12,15,30, is X divisible by 8? [#permalink]

Show Tags

12 Dec 2012, 23:39

1

This post received KUDOS

laythesmack23 wrote:

If X is divisible by 2,6,9,12,15,30, is X divisible by 8?

The easiest method to arriving at an answer?

Findout factors and derive unique combination of it. But that should be done only for very complicated numbers. For small numbers u can just observe:

For the given question.. we have 8 => 2^3 None of the given choices can give u a multiple of 2^3. So ans is No.

To find out how to use it, If the question has asked 18 then? factors, 18 = 2 * 3^3 We have 2 which gives 2^1 and 9 which gives 3^3. Hence Ans would have been Yes.
_________________

Re: If X is divisible by 2,6,9,12,15,30, is X divisible by 8? [#permalink]

Show Tags

13 Dec 2012, 11:54

I didnt get the point

We can see a multiple of 8 too!

12 = 4 X 3 2 is already there. so we do have 2^3 right?

Vips0000 wrote:

laythesmack23 wrote:

If X is divisible by 2,6,9,12,15,30, is X divisible by 8?

The easiest method to arriving at an answer?

Findout factors and derive unique combination of it. But that should be done only for very complicated numbers. For small numbers u can just observe:

For the given question.. we have 8 => 2^3 None of the given choices can give u a multiple of 2^3. So ans is No.

To find out how to use it, If the question has asked 18 then? factors, 18 = 2 * 3^3 We have 2 which gives 2^1 and 9 which gives 3^3. Hence Ans would have been Yes.

Re: If X is divisible by 2,6,9,12,15,30, is X divisible by 8? [#permalink]

Show Tags

13 Dec 2012, 19:10

ambitiousgal wrote:

I didnt get the point

We can see a multiple of 8 too!

12 = 4 X 3 2 is already there. so we do have 2^3 right?

No.. 12 = 2^2 * 3^1 2 = 2^1 in both 2 and 12 there is one common 2. When u need to find out if a number A is divisible by number B, you need to be able to ascertain that all the factors of B are in A. So if a number X is divisible by 12 and 2, you know that X has atleast 2^2 and 3^1 (For it to be divisible) it can guarantee that X will be divisible by 2, 4, 6, 12. Beyond this, this information can not give anything else. eg. consider that X =12. It is divisible by 12 and 2 but not by 8.
_________________

Re: If X is divisible by 2,6,9,12,15,30, is X divisible by 8? [#permalink]

Show Tags

20 Feb 2013, 00:14

I'll say NO. Take for ex 180. It is divisible by all 2,6,9,12,15,30.......... but not divisible by 8. So, as 2,6,9,12,15,30 does not have a multiple of 8, there LCM is not divisible by 8
_________________

I'll say NO. Take for ex 180. It is divisible by all 2,6,9,12,15,30.......... but not divisible by 8. So, as 2,6,9,12,15,30 does not have a multiple of 8, there LCM is not divisible by 8

Technically, it is incorrect to say 'No'. The answer to the question is 'Cannot say/May be'

Looking at the factors, we do not see any which has an 8 in it so we cannot say that X must have 8 as a factor. But, there is nothing to say that it is not divisible by 8 in addition to all the factors given above.

i.e. X can be 180 (as you pointed out) and X can also be 360 (in which case it is divisible by 8)
_________________

Hey, guys, So, I’ve decided to run a contest in hopes of getting the word about the site out to as many applicants as possible this application season...

Whether you’re an entrepreneur, aspiring business leader, or you just think that you may want to learn more about business, the thought of getting your Masters in Business Administration...

Whether you’re an entrepreneur, aspiring business leader, or you just think that you may want to learn more about business, the thought of getting your Masters in Business Administration...