GMAT Permutation Guide Ch 1: Permutation Introduction Ch 2: Problem Variations
 GMAT Combination Guide Ch 1: What is a Combination? Ch 2: Permutation / Combination? Ch 3: Groups/Pairings
 GMAT Probability Guide Ch 1: Simple Probability Ch 2: Multiple Events Ch 3: Independent Events Ch 4: Working Backwards Ch 5: A Different Method Ch 6: Extra Questions
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Chapter 1: Simple Probability

Probability is often seen as the real evil of the GMAT. But the truth is that by mastering one simple fraction, you can make probability approachable and even easy.

Let’s say that you have a single six-sided die. If you role it, what is the probability you would roll a 5?

There are 6 sides to the die, and each one could come up. The 5 side is one of those sides, right? So there are 6 possible outcomes, and the five is one of them. Therefore, there is a 1 in 6 probability that the five will come up.

 800Score Technique: The Bottom and the Top If you want to make probability approachable, just think of it as a fraction to solve Bottom to Top. The bottom number is the total number of possibilities that could happen, and the top number is the number of possible ways to achieve the desired result.

Or, more simply:

 Probability = what we want all of what’s possible.

Apply that to the above example:
Bottom: 6 outcomes are possible
Top: 1 outcome we want
Probability: 1/6

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