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Very SIMPLE OG 12th Ed. DS Number Properties Question


beyondenim

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I don't think your example works here:

 

sqrt = square root

 

 

if sqrt(n) is an integer (statement 2)

 

then, sqrt(n) x sqrt(n) = n

integer x integer = integer

 

therefore n is an integer

 

if the square root of n is an integer, we are basically told that n is a perfect square.

 

hope this helps.

 

This is Question 169 in the Official Guide

 

GMAT: Data Sufficiency 38 | Khan Academy

 

For Khan Academy, this questions begins at 2:35

 

This is Question 146 in OG 11th Edition,

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From st 1, n^2 = integer - does not confirm that n is an integer. For example, sqrt(2) is not an integer, BUT (sqrt(2))^2 is integer. SO, 1 is not sufficient. A,D out.

From st 2, sqrt(n)= integer. SO, n must be an integer. ENOUGH. B is the answer.

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