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Permutations with Restrictions
So far, we’ve covered the basics of GMAT combinatorics, the difference between permutations and combinations, some basic permutation and combination math, and permutations with repeat elements. Now, we’ll see what happens when permutation problems involve conceptual...
An Intro to Combination Math
Last time, we looked at the following GMAT combinatorics practice problem, which gives itself away as a PERMUTATION problem because it’s concerned with “orderings,” and thus we care about the order in which items appear: At a cheese tasting, a chef is to present some...
Data Sufficiency: Area of a Triangle Problem
Today we're checking out a geometry Data Sufficiency problem asking for the area of a triangle, and while the ask might seem straightforward, it's very easy to get caught up in the introduced information on this problem. And this is a great example of a way that the...
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