GSET: Logical Reasoning

The GSET Logical Reasoning domain tests argument analysis: finding conclusions and premises, identifying assumptions, strengthening or weakening arguments, drawing inferences, and spotting flawed reasoning. Some items use conditional logic, so quantifiers and direction matter.

Core rules

• Separate the conclusion from the evidence. The conclusion is the claim the author wants you to accept.
• Prephrase the gap between evidence and conclusion before reading the choices.
• For assumption questions, negate the choice. If the negation destroys the argument, the choice is necessary.
• For strengthen or weaken questions, attack or support the link between evidence and conclusion, not the evidence itself.
• For inference questions, accept only what must follow from the statements; "could be true" is not enough.
• In conditional logic, "If P then Q" does not imply "If Q then P." The valid contrapositive is "If not Q then not P."

Worked example

Argument: "A bakery's sales rose 20% in the month after it began offering free samples. Therefore, the free samples caused the increase." The conclusion is causal; the evidence is a correlation. A weakener is that the bakery also launched a social-media campaign that same week, giving an alternative cause. A strengthener is that nearby bakeries without samples saw no increase while this bakery's sales rose only in stores offering samples. Saying "correlation is not causation" without a specific alternative is too vague to earn the mark.

Traps

• Strengthening the premises instead of the reasoning link.
• Confusing necessary with sufficient conditions.
• Choosing an answer that is merely consistent with the argument rather than sufficient.
• Reversing conditional statements or misreading "some" as "all."
• Addressing a different conclusion from the one stated.