Question: If m and n are positive integers, is \((\sqrt m)^n\) an integer?
(1) √m is an integer.
(2) √n is an integer.
A) Statement (1) ALONE is sufficient, but statement (2) ALONE is not sufficient.
B) Statement (2) ALONE is sufficient, but statement (1) ALONE is not sufficient.
C) BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D) EACH statement ALONE is sufficient.
E) Statements (1) and (2) TOGETHER are not sufficient.
Approach Solution 1
Or \({m}^{n/2}\)is an integer
It is given that m and n are integers,
Using statement (1) we get
\(\sqrt m\) is an integer.
Then, we also know that , \((integer) ^{ integer}\) is also an integer.
It is sufficient statement.
Using 2 we get
\(\sqrt n\)is an integer.
Or we can say n is an integer.
For example, let m = 3, n = 9
\(\sqrt(m)^n\) = \(\sqrt(3)^9\) is not an integer
Hence, it is not sufficient to get the answer.
Hence, A is the correct answer.
Approach Solution 2
Also \(m^{n/2}\) is an integer.
Given that m and n are both integers, assertion (1) reveals that m is also an integer.
Additionally, we are aware that \((integer)^{integer}\) is an integer.
The statement is adequate.
Inferring from 2, which \(\sqrt n\) is an integer.
Let m = 3 and n = 9, for instance. Then \(\sqrt (m)^n\) = \(\sqrt(3)^9\) is not an integer.
Consequently, it is not enough to obtain the solution.
A is the right response, thus.
Approach Solution 3
Additionally, \(m^{n/2}\) is an integer.
As a result of the fact that both m and n are integers, we can deduce from statement (1) that m is likewise an integer.
In addition, we are aware that one integer can be obtained by multiplying two integers together.
.Following on from the number 2, \(\sqrt n\) must be an integer.
For the sake of this example, let m equal 3 and n equal 9. Then \(\sqrt (m)^n\) =\(\sqrt(3)^9\) is not an integer.
As a consequence of this, it is not sufficient to find the solution.
As a result, A is the correct response.
“If m and n are positive integers, is root(m)^n an integer?" - is a topic of the GMAT data sufficiency section of GMAT. This question has been borrowed from the book “GMAT Official Guide Quantitative Review”.
To understand GMAT data sufficiency questions, applicants must possess fundamental qualitative skills. Quant tests a candidate's aptitude in reasoning and mathematics. The GMAT Quantitative test's problem-solving phase consists of a question and two statements. By using mathematics to answer the question, the candidate must select the appropriate response among five choices which states which statement is sufficient to answer the problem. The data sufficiency section of the GMAT Quant topic is made up of very complicated math problems that must be solved by using the right math facts.
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