Logical Reasoning: Syllogisms Flashcards
7 cards from real Crossover Aptitude Test practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
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Statement 1: All cars are vehicles. Statement 2: All vehicles need fuel. Conclusion: All cars need fuel. Is the conclusion:
Answer: True
Both premises are universal affirmatives, so the conclusion that all cars need fuel necessarily follows.
Some athletes are vegetarians. All vegetarians avoid meat. Which is definitely true?
Answer: Some athletes avoid meat.
The athletes who are vegetarians must avoid meat, so some athletes avoid meat.
No mammals are cold-blooded. All fish are cold-blooded. Therefore:
Answer: No fish are mammals.
Mammals cannot be cold-blooded, and fish must be cold-blooded, so the two groups cannot overlap.
All P are Q. Some Q are R. Which conclusion is INVALID?
Answer: All P are R.
We cannot conclude all P are R because only some Q (which contains P) are R.
All honest people keep promises. John does not keep promises. Therefore:
Answer: John is not honest.
By contrapositive, if someone doesn't keep promises, they are not honest.
Some books are fiction. All fiction entertains. Some books are textbooks. What can be concluded?
Answer: Some books entertain.
The books that are fiction entertain, so at least some books entertain.
All M are N. All N are O. No O are P. Therefore:
Answer: No M are P.
M is entirely within N, N is entirely within O, and O has no overlap with P, so M has no overlap with P.