LSAT 35, Logical Reasoning I, Q22, LSATHacks

QUESTION TEXT: No chordates are tracheophytes, and all members…

QUESTION TYPE: Sufficient Assumption

CONCLUSION: P ➞ not H

REASONING: C ➞T and P ➞ T. These can be joined to form P ➞ T ➞C

ANALYSIS: This question is truly worth drawing. We have to get from P to not H. Notice that nothing is connected to H. So the only way we can get there is through T and C. Here’s what we have so far:

P ➞ T ➞C    ????  H    

Just put an arrow in place of the question marks and we get our conclusion: P ➞ T ➞C➞H

So the right answer has to be either “C➞H” or the contrapositive of that: “H ➞ C”

___________

1. This doesn’t work. We can’t connect it up to our diagram to reach the conclusion. If no H were T, this would have worked. 
2. CORRECT. See the diagrams above. 
3. This doesn’t help us connect anything to H. The right answer will always have to mention the disconnected term.
4. This tells us that if you are C then you are not H. That doesn’t help, because Ps are not Cs.
5. This still leaves us without any connection to H.

LawHub Order

LawHub Order

---