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June 2007, Game 1, Question 3

The content provides a detailed walkthrough on solving a specific GRE question type that involves conditional reasoning and the creation of split sketches to determine what must be true.
  • The question presents a scenario where the third digit of a sequence cannot be a 0, requiring the examination of two possible sketches.
  • In each scenario, a different non-zero digit is assigned to the third position, leading to distinct outcomes for the sequence.
  • The correct answer is identified by determining which condition holds true across all considered scenarios, in this case, that the fourth digit must be a 0.
  • Other answer choices are systematically evaluated and dismissed based on the established conditions of the sketches.
Introduction to Conditional Reasoning
Creating Split Sketches
Determining the True Condition
Evaluating Answer Choices