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PrepTest 73, Logical Reasoning 2, Question 8

The content provides a detailed walkthrough of solving an inference question on the GRE, focusing on interpreting information correctly and eliminating incorrect answer choices based on the given data.
  • Inference questions require understanding the given information and selecting an answer that can be proven true.
  • The passage discussed involves analyzing how fluoride enters groundwater, emphasizing the role of sodium in increasing fluoride concentrations.
  • Key to solving the question is distinguishing between what is directly stated and what is inferred, particularly concerning the sources of fluoride and sodium.
  • Incorrect answer choices are eliminated through a process of logical deduction, highlighting the importance of closely reading both the passage and the answer choices.
  • The correct answer (D) is identified by linking the increased fluoride concentrations with the presence of sodium, supported by the controlled variables in the study.
Understanding Inference Questions
Analyzing the Passage
Eliminating Incorrect Answers
Identifying the Correct Answer