Question: Not divisible by 6

Awesome. Exactly what the Gre is about. These video are saving a lot of time. Quality questions is what we require. Understanding a few good questions the right way is better than working on more questions.Thanks Mr Brent. One question though. Why do you put cute pics on the right side of the website ?

Thank you so much! The first time around when I went through these videos using the two techniques (rebuilding the dividend and listing possible values of the dividend) I got really frustrated because it didn't make sense to me at all. Going through the videos a second time has helped a lot! To all those students struggling...revisiting topics DEFINITELY helps! So if you don't understand something the first time, move on and come back with a fresh perspective and things will seem much more clear!!

Hi Brent,

First, thank you very much for posting and hence showing us so *many* different ways to approach the questions in this lesson (Integer Properties, Intro to Remainders).

The variety you employ in your solutions somehow makes the patterns and underlying logic in this area more obvious and more comprehensible, especially in the 160-170 level questions. Awesome!

Second, I have a question about strategy in this problem regarding your second approach: after listing possible values of N and finding that answer choice D doesn't work, must we still check answer choice E?

I probably would do so regardless. But what if the answer were B? Would we still need to check the other choices? (Again, if there were time, I would probably do so.)

In this particular context (i.e., we find values of integers that must satisfy constraints dictating how integers behave), there seem to be quite a few occasions in which finding the case that does not satisfy yet another constraint seems to be the definitive result. I am just wondering....