it says n/a where a is +ve integer; n is the smallest value of k such that n^2=72k then n=|sqrt(72k)| -- hence the smallest value of k could be only 0, as according to GMAT conventions -ve square root value is not defined. So n is the smallest value of k OR n=0 as |0| is still 0; our solution ends here --> 0/a is always 0.
fernandonefro1 wrote:why the largest positive integer that must divide n = smallest value of k such that n to power of 2 = 72k?
