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


This is a partial free sample of our prep guide. To view the remainder of this page, purchase the 800score Prep Course.

 

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 Probability of Multiple Events