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 ➞
So the right answer has to be either “
C➞ H” or the contrapositive of that: “H ➞ C”
- 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.
- CORRECT. See the diagrams above.
- This doesn’t help us connect anything to H. The right answer will always have to mention the disconnected term.
- This tells us that if you are C then you are not H. That doesn’t help, because Ps are not Cs.
- This still leaves us without any connection to H.
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