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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
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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
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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
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Cheers! Ravi

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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
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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
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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
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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.