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 350,000 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:

Nowhere does S1 say that x is an INTEGER. If x is \frac{3}{2}, the expression from the question stem might look like this: \frac{7^7}{7^x} = \frac{7^7}{7^{\frac{3}{2}}} = \frac{7^7}{\sqrt{7^3}}

Obviously, this is not an integer.

Hope this helps.

kotofei4 wrote:

That's what it says: Statement (1) by itself is insufficient. S1 says that can be between 0 and 7, so it can be an integer or any fraction.

Statement (1) by itself is sufficient. S2 implies that is one of (-1, 0, 1). .

The correct answer is B.

Anyway, it is probably just a bug. I wanted to make sure that I am not the only person who thinks that the indicated answer is wrong.

Nowhere does S1 say that x is an INTEGER. If x is \frac{3}{2}, the expression from the question stem might look like this: \frac{7^7}{7^x} = \frac{7^7}{7^{\frac{3}{2}}} = \frac{7^7}{\sqrt{7^3}}

Obviously, this is not an integer.

Hope this helps.

kotofei4 wrote:

That's what it says: Statement (1) by itself is insufficient. S1 says that can be between 0 and 7, so it can be an integer or any fraction.

Statement (1) by itself is sufficient. S2 implies that is one of (-1, 0, 1). .

The correct answer is B.

Anyway, it is probably just a bug. I wanted to make sure that I am not the only person who thinks that the indicated answer is wrong.

Thanks

Dang !!!! I ALWAYS miss out on fractions ... Thanks so much dzyubam. +1 _________________

In the land of the night, the chariot of the sun is drawn by the grateful dead

This is a wonderfully written question and put in to your head - always check the question to make sure whether the value is integer /fraction _________________

Nice explanation..dzyubam... I think whenever answering the questions relating to integers (number systems, in general), and where variables can assume a range of values, I try to imagine the diagram of a number line, with 0, +ve and -ve numbers...tht helps me tide over these questions.

Statement 1 Insufficient because: When x = 2, The result is integer When x = 2.1, the result is non-integer

Statement 2 is sufficient because: The only values that satisfy the given condition are: { -1, 0, 1}. All these 3 inputs for x give the Integer result.

Hence, B

Cheers! Ravi _________________

Cheers! Ravi

If you like my post, consider giving me some KUDOS !!!

the indicated answer is B while I was sure it was D.

I don't understand how 1 is not sufficient - IMHO it must be an integer.

Thanks.

we have \frac{7^7}{7^x} or 7^(7-x) lets start- stmt1-0 \le x \le 7 -not suff, since we do not know whether x is integer or not. x could be 0 or 1/2 etc

stmt 2- |x|=x^2 it means that x could be -1,0,1 . applying any of these numbers we get an integer. so, stmt 2 is suff _________________

Happy are those who dream dreams and are ready to pay the price to make them come true

Great question to highlight the trap that GMAT sets when working with integers and fractions. I too have fallen into it more than once and now always read the question carefully for words like "Integer", "Positive Integer" etc.

If none of these words are mentioned, I always assume that all numbers are valid. Here with the integer in the question, one can easily be thrown off assuming that x is also an integer, when clearly, it doesn't have to be.

IMO B. S1 if x= 3 then answer is an integer if 3/2 then answer is not an integer. hence insufficient s2 x can be 1 0 or -1 hence sufficient _________________

For every data sufficiency question, Always apply the FOIN checks Can the variable in question assume any of the following types of values :

Fraction 0Zero Integer or Irrational Negative _________________

----------------------------------------------------------------------------------------------------- IT TAKES QUITE A BIT OF TIME AND TO POST DETAILED RESPONSES. YOUR KUDOS IS VERY MUCH APPRECIATED -----------------------------------------------------------------------------------------------------

Nice question. I eliminated A and D due to the possibility that X could be a fraction. However, I did something weird and didn't realize that |x| had to be -1, 0, 1. I selected C.

Statement 1 is a kind of common trap. It does not state that x must be integer. Our minds automatically goes for integers and the trap got us badly! If x does not be an integer the answer would be a non-integer. So A and D are out.