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Permutations A permutation is a possible order in which to put a set of objects.  Suppose I had a shelf of 5 different books, and I wanted to know: in how many different orders can I put these 5 books?  Another way to say that is: 5 books have how many different permutations? In order […]

Formulas A rate is how fast something is growing, changing, or being performed.  The overarching rate formula is: Amount = Rate x Time   When the rate is a speed, this simplifies to the familiar formula: Distance = Speed x Time   In questions about speed, especially where an object travels at one speed for […]

Parallelism can come in many forms on the GMAT. Here are five famous passages: see if you can identify all the parallel structures, and below, I’ll discuss them. (Kudos, also, for recognizing the sources!)  Each quote is preceded by a difficulty rating, assessing how hard it is to identify the parallelism in that quote. The […]

Everyone knows how to find an average, but the power of this formula is often underestimated.  We know: average = (sum of the items)/(number of items) Notice, we can also write this as: sum of items = (average)*(number of items) This latter form can be powerful.  For example, if we add or subtract one item […]

As you may remember from high school, , where b is the base and h is the height.  If you are having trouble remembering this, simply remember that a rectangle has an area of , and that a triangle is half a rectangle. Practice Question: Using the Area Formula The figure on the left is […]

There’s a reason this is the most famous theorem in mathematics!  This remarkable theorem is one of the most versatile and highly adaptable formulas in existence.  Of course, I’m sure you remember that it says: For any right triangle,                       Of course, if any question […]

Full-time or Part-time? One of the most important decisions you will have to make before considering which MBA program to apply to is whether to attend full or part time. As you make this decision, review a few key reasons for pursuing an MBA: 1. Knowledge—you’ve realized that your anthropology degree has left some key […]

To be enamored means to be in love with or to really like something. So which of the following is the correct idiomatic usage? He was so enamored of/by/with beagles that he volunteered to adopt unwanted beagles from the dog kennel. Two of the above are appropriate. Indeed, all three prepositions could work, however one […]