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 Understanding the Question Type
  Data Sufficiency questions show up in the Math section on the GMAT. They will be mixed in with the other Problem Solving questions. The format for all Data Sufficiency questions will be the same.

The top part of the question is the question itself. You will find out what the question writer is challenging you to solve, or at least if the question is solvable given the extra information that is given in the second part of the question.

The second part of the question consists of two numbered statements. Your job is to determine how important these statements are in solving the question. Each statement might be enough alone, or they may need to be used in combination with each other, or they may not help at all. The answer choices, A - E, are always the same and the correct choice is based on how necessary the two statements are in solving the problem.

Knowing A - E will save you time on the test. Memorize them because they will always show up in the same order.

A. Statement (1) ALONE is sufficient to answer the question, but statement (2) is not.

B. Statement (2) ALONE is sufficient to answer the question, but statement (1) is not.

C. Statements (1) and (2) together are sufficient to answer the question, but the statements by themselves are not sufficient.

D. Either statement ALONE is sufficient to answer the question.

E. Statements (1) and (2) taken together are NOT sufficient to answer the question, unless more data is given.

* The most important thing to realize is that you don't need to actually solve the question. Just determine if the question is solvable given the extra information from statements (1) and (2).

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  - Algebra   
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  - Word Problems  
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 GMAT Math Review Topics...
Topic 1 : Basic Arithmetic
Topic 2 : Averages
Topic 3 : Factors/Multiples
Topic 4 : Fractions/Ratios
Topic 5 : Percents
Topic 6 : Powers
Topic 7 : Rates
Topic 8 : Basic Algebra
Topic 9 : Combine Terms
Topic 10 : Quadratic Eq
Topic 11 : Inequalities
Topic 12 : Substitution
Topic 13 : Basic Geometry
Topic 14 : Angles
Topic 15 : Polygons
Topic 16 : Triangles
Topic 17 : Circles
Topic 18 : Data Sufficiency
 GMAT Verbal Review Topics...
Topic 1 : Idiomatic Exp
Topic 2 : Modifiers
Topic 3 : Parallelism
Topic 4 : Pronouns
Topic 5 : Structure
Topic 6 : Style/Conciseness
Topic 7 : Subj/Verb Agreement
Topic 8 : Verb Tenses
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