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   GRE Permutation Guide
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spacer active_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 left_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 1: Introduction to Permutations
 
 

Permutation questions are about taking a group of objects and totaling how many ways we can arrange them in specific ways. Here is an example that we will explain later.

In how many ways can a pet shop line up 3 cats and 3 dogs in 6 cages if the cats must be in the second, fourth, and sixth cages?


I. The Basics: Three Steps to Permutation Clarity

1. Figure out how many places there are to fill.
2. Figure out how many objects potentially can go into each place.
3. Multiply for the answer.


Example

How many outcomes are there when two identical dice are rolled?


Following the steps:


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 Chapter 2: Problem Variations