DS problem 169 - Quant review 2nd Edition (Need Help)

[kkrish]

Hey guys,

I have been trying to decipher Prob 169 from the 2nd ED quant guide and its been driving me nuts.

Question:
where N is a positive integer;
N^2 is 72;
Identify the largest positive integer that must divide N;


I understand the explanation (more comsi, than comsa), but I am unsure if I can make all these assumptions on the test.

Any explanations from fellow Gmatters is much appreciated.

Thanks
KK

[kvcpk]

Please post the complete question. Someone will definitely come to your rescue..

Cheers!!

[Viktri]

Is the answer 3?

N = 72 ^0.5
72 = 9 x 4 x 2
9^0.5 = 3

[goyalsau]

is it

6