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:

I don't understand what you mean slot straights into above equation. When I simplify the f(3) I get -1 and for f(6) I also get -1. Is that why both are sufficient? I don't understand why Statement 1 the f(3)=14. What I supposed to do something else?

I don't understand what you mean slot straights into above equation. When I simplify the f(3) I get -1 and for f(6) I also get -1. Is that why both are sufficient? I don't understand why Statement 1 the f(3)=14. What I supposed to do something else?

Hii. See the question gives us the relation: \(f(n)=f(n-1)-n\) and the question asks the value of \(f(4)\).

As per the above relation, if we expand \(f(4)\), we get: \(f(4)=f(3)-4\)---------[a]

Now coming to the statements: Statement 1 gives us direct \(f(3)\). We just have to put in equation [a]. Statement 2 gives us \(f(6)=-1\). \(f(6)\) can be expanded as \(f(5)\)-6. Moreover \(f(5)\) can be expanded as \(f(4)-5\). Put this value of \(f(5)\) in the former one. It will become \(f(6)=f(4)-9\), which will gives the value of \(f(4)\) as 10.

Both are sufficient. Hope that helps.
_________________

I don't understand what you mean slot straights into above equation. When I simplify the f(3) I get -1 and for f(6) I also get -1. Is that why both are sufficient? I don't understand why Statement 1 the f(3)=14. What I supposed to do something else?

Hii. See the question gives us the relation: \(f(n)=f(n-1)-n\) and the question asks the value of \(f(4)\).

As per the above relation, if we expand \(f(4)\), we get: \(f(4)=f(3)-4\)---------[a]

Now coming to the statements: Statement 1 gives us direct \(f(3)\). We just have to put in equation [a]. Statement 2 gives us \(f(6)=-1\). \(f(6)\) can be expanded as \(f(5)\)-6. Moreover \(f(5)\) can be expanded as \(f(4)-5\). Put this value of \(f(5)\) in the former one. It will become \(f(6)=f(4)-9\), which will gives the value of \(f(4)\) as 10.

Both are sufficient. Hope that helps.

Yes, thank you! But we don't use the =14 anywhere? What's the purpose of it then?

Re: If n is an integer and f(n) = f(n 1) n, what is the value of [#permalink]

Show Tags

18 Dec 2012, 00:41

In statement 1, put f(3)=14. You will get the answer as 10. In DS, if you know that with the given information a particular question can be solved then rather than trying to find the exact answer, move to the next statement. In the explanation, I did the same.

The equation says f(n) = f(n-1) - n (1) states f(3)=14 and we need to find f(4) so as per the equation, f(4) = f(4-1) -4 ==> f(4)=f(3)-4 ==> f(4)=14-4=10 So (1) is sufficient...Hope explanation for (2) is already clear. And this expalins the use of f(3)=14 as well. So the answer is D
_________________

I don't understand what you mean slot straights into above equation. When I simplify the f(3) I get -1 and for f(6) I also get -1. Is that why both are sufficient? I don't understand why Statement 1 the f(3)=14. What I supposed to do something else?

Re: If n is an integer and f(n) = f(n 1) n, what is the value of [#permalink]

Show Tags

31 Jan 2014, 10:49

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.
_________________

Re: If n is an integer and f(n) = f(n 1) n, what is the value of [#permalink]

Show Tags

21 Mar 2016, 04:32

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.
_________________

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...

Term 1 has begun. If you're confused, wondering what my post on the last 2 official weeks was, that was pre-term. What that means is that the school...