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36 pages Table of contents
This section is broken into three parts:
A. Introduction
B. Data Sufficiency Trick Questions
C. More practice questions
A. Introduction
The Data Sufficiency questions (typically 1/3 of all the quantitative questions) do not require the test taker to find an exact answer. Instead, they require you only to determine if each of the statements provides enough information for solving the question.
Data Sufficiency question instructions look like this:
Directions: In each of the problems, a question is followed by two statements containing certain data. You are to determine whether the data provided by the statements are sufficient to answer the question. Choose the correct answer based upon the statement's data, your knowledge of mathematics, and your familiarity with everyday facts (such as number of minutes in an hour or cents in a dollar). (international students: 100 cents to the dollar).
Note: Diagrams accompanying problems agree with information given in the questions, but may not agree with additional information given in statements (1) and (2).
All numbers used are real numbers.
Memorize the Data Sufficiency answer choices.
The directions and answer choices for Data Sufficiency questions never change. Memorize them so that you have no problems on test day. There is no excuse for walking into test day without these five answer choices perfectly memorized!
A) if statement (1) by itself is sufficient to answer the question, but statement (2) by itself is not;
B) if statement (2) by itself is sufficient to answer the question, but statement (1) by itself is not;
C) if statements (1) and (2) taken together are sufficient to answer the question, even though neither statement by itself is sufficient;
D) If either statement by itself is sufficient to answer the question;
E) If statements (1) and (2) taken together are not sufficient to answer the question, requiring more data pertaining to the problem.
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Some students confuse C and D. Read each answer choice carefully.
- Note that A requires that B not be sufficient, and vice versa with B.
- C stipulates that A and B cannot be able to answer the question alone. This means that although A and B together may be able to answer, the answer is not C if either one can answer the question alone.
- The answer is D if both can answer the question independently, even if both can answer the question together.
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