harsh.champ wrote:
Hey sanju09,
I see that you have pointed out 2 divisibility rules.
My question is that :Isn't it better to solve the question using the long approach as given by ramsharma.
I personally don't gain any confidence until I solve the questions involving both the "power" and the "divisibility rules".
Going by the long approach atleast I can be sure of my answer or should I try to save some time on these question types by just remembering the rules and applying shortcut techniques.
Seeking advice??
Ramsharma's approach is to show why statement (2) by itself is sufficient and he did justice with that. While dealing with small positive integer numbers and powers simultaneously, his approach is quite handy. This question could be answered well within 2 minutes with his approach, no doubt. But that never means that a GMAT aspirant can deal with its quantitative section effectively without learning and practicing the most required strategies and short cuts that have been tried and tested so many times on the test so far. Divisibility rules of very a few positive integers, like 2, 3, 4, 5, 6, 8, 9, and 11 are very important to ponder and practice before writing the main test.
It's true that going by the long approach at least they can be sure of their answer but that won't work for them throughout the section. You'll start getting faith in strategies and short cuts too, once you give it few chances, and that would, in fact, turn out to be really productive for you on real test.
ATB
