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   GRE Word Problems Guide
Ch 1: Word Problem Strategies
Ch 2: 5-Step Method
Ch 3: Functions & Symbols
Ch 4: Progressions & Sequences
Ch 5: Percentages
Ch 6: Interest
Ch 7: Ratio & Proportion
Ch 8: Uniform Motion
Ch 9: Work & Rate
Ch 10: Grouping & Counting
Ch 11: Data Interpretation
Ch 12: Averages & Median
 
 

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   Word Problems: Progressions & Sequences (Medium / Hard)
Table of Contents  
 

An ordered list of numbers is called a sequence, and each individual number is a term. Here is a simple sequence of consecutive even integers.

2, 4, 6, 8, 10.…

Here you may assume the next number of the sequence is 12, but often you can't make these assumptions.

Sequence Formula
Sequences use "subscript" which is small font at the foot of a letter. Think of this as a mechanism that generates integer numbers and runs them through a function like a computer.

an = 5 + n
Here the subscript n is defined by the rule 5 + n. So this sequence will be a series of multiples of integers + 5 starting with 1.
6, 7, 8, 9, 10, 11, 12...
an = 5n
Here the subscript n is defined by the rule 5n. So this sequence will be a series of multiples of 5:
5, 10, 15, 20, 25, 30...

 


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  Contents of Word Problems Chapter: Table of Contents
Chapter 1: Word Problems & Strategies
  Chapter 2: 5-Step Method
  Chapter 3: Functions & Symbols
  Chapter 4: Progressions & Sequences
  Chapter 5: Percentages
  Chapter 6: Interest, Discount & Markups
  Chapter 7:
Ratio & Proportion
  Chapter 8: Uniform Motion
  Chapter 9: Work & Rate
  Chapter 10:
Grouping & Counting
  Chapter 11: Data Interpretation
  Chapter 12: Averages & Mean
 
Percentages

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