by ApexGMAT | Feb 25, 2021 | Combinatorics, GMAT, Probability, Quant

As promised in the last post, today we’ll discuss what happens when we have a PERMUTATIONS situation with repeat elements. What does this mean exactly? Well, let’s return to the basic example in our intro post on GMAT combinatorics: If we have five distinct paintings,...
by ApexGMAT | Sep 3, 2020 | GMAT, Meta-Strategy, Number Theory

I’m here with a number theory data sufficiency problem. Like many of the other problems, we’re going to look at this problem over here, structurally, as well as mathematically. Taking a look at the stem the first thing we are struck by is the idea that we...