this is question number 146 from the data sufficency section.
is n an integer?
1) n ^ 2 is an integer
2) square root of n is an integer
forgive me if others have said this... i am just going off the top of my head without looking at others explanations
i don't quite get the OA for this one. it seems easy, but their answer makes no sense. thanks..
if n^2 is an integer, n could or couldnt be an integer. if n^2=4 yes, then n=2
if n^2 = 2, then no n= sqrt(2)
sqrt n = some integer k. then n = k^2. any integer squared is an integer.