Unit 6 · Identifying Sufficient Information
Strawberries Are Fruit — Which Two Facts Prove It?
Lesson 2 of 12
Now for the other common format in this unit — instead of finding a missing fact, you are building a logical proof. Two statements must work together to form a complete deductive chain that leads inevitably to the conclusion.
Two-statement proof questions appear regularly in OC TS. The classic mistake is selecting a pair that is about the right topic but doesn't actually connect logically — "related" is not the same as "sufficient proof".
The examiner wants to confirm that you can construct a valid two-step logical argument — a syllogism — where statement A and statement B together force the conclusion. Both statements must be needed; neither alone is enough.
A statement is given that must be proven. Four statements (I–IV) are listed and you find the pair that creates a complete chain: one statement provides a general rule ("all X are Y"), the other places the subject into category X, and the conclusion follows automatically.
Best approach: Look for a general rule ("anything with property P is a Q") and a specific fact ("this thing has property P"). When both are true, the conclusion follows with no extra steps. If you need a third fact to bridge the gap, the pair is not sufficient — keep looking.
Question
"Strawberries are a fruit."
Which two of the following statements together prove the above statement?
- I. A fresh produce with seeds is a fruit
- II. Strawberries have seeds
- III. Berries are fruits
- IV. Seeds grow fruits
Select an answer to see the explanation.
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