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   GRE 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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   GRE Combination Guide
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spacer left_arrow Ch 1: What is a Combination?
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spacer active_arrow Ch 2: Permutation / Combination?
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spacer left_arrow Ch 3: Groups/Pairings
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   GRE Probability Guide
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spacer left_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 2: Permutation or Combination?
 
 

 

800score Tip:
Half of the challenge in most combination/permutation questions is correctly identifying if it is a combination or permutation question. Once you know this, most become easy.


1. Does order matter?
“Does it matter if the two items (or however many items you have) positions are changed?” If the answer is yes, it is a permutations problem, if not, it is a combinations problem.

2. If the word “arrangements” is in the problem, it is a permutations problem.
The term “permutations” will rarely be in a GRE problem.



3. If the word “combinations” is in the problem, it is a combinations problem.

Don't think it'll be that easy often!

Here are 7 examples each of permutations and combinations. Read through them and try to think out each one. You will soon see the difference between permutations and combinations
.


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

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 Chapter 3: Problem Variations