Introduction
Inference questions in the Information and Ideas domain ask you to go one step beyond what is directly stated — but only one step. The specific skill covered here is drawing an inference by linking two or more explicit statements already present in the passage: connecting a general principle to a specific case, or connecting a research finding to a stated limitation. This is distinct from completing a logical gap mid-passage (covered in Logical Completion Questions) and from avoiding overreach (covered in Inference Questions: Scope and Extremes). Here, the target inference is not stated, but it is fully determined once you mentally combine two premises the author has given you.
This skill appears in roughly 26% of the Reading and Writing section (Information and Ideas domain), spread across both adaptive modules. Expect 1–3 questions of this exact type per test.
Core Concept
Every inference of this type is built from the same logical skeleton:
Premise A (general principle or finding) + Premise B (specific case or limitation) → Conclusion C (the inference)
Your job is to identify C — the statement that must be true given A and B together, yet is not explicitly stated as a third sentence in the passage.
Two common structures you will see:
| Structure | Premise A | Premise B | Inference C |
|---|---|---|---|
| General → Specific | "Enzymes speed up reactions by lowering activation energy." | "Catalase is an enzyme." | Catalase lowers the activation energy of its reaction. |
| Finding → Limitation | "The study found X under condition Y." | "Condition Y was absent in urban samples." | The study's finding may not apply to urban samples. |
The correct answer will be:
- Supported by both premises together (neither premise alone is enough)
- Narrowly scoped — it does not add facts from outside the passage
- Necessary, not merely possible — you cannot just say "it's consistent with"; the text must compel it
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