Everyone hates rule substitution questions. But I actually don’t think they’re that hard. You have to ask the right questions:
- Does this new rule add the same restrictions?
- Does it allow everything that used to be allowed?
Most of the wrong answers add weird new restrictions. You can use your past scenarios to eliminate answers. If an answer contradicts a past, working scenario, then that answer is WRONG!
LSAT answers are worthless. Don’t give them the time of day. They’re 80% likely to be wrong. Approach them looking for reasons to disprove them.
Now, we’re looking for something that makes telephone “not last”.
A seems to add the correct restriction. If telephone is before gas or satellite, it’s not last. Let’s come back to this.
B and D add weird new restrictions that weren’t in the original setup. Telephone doesn’t need to be directly in front of gas or satellite. This scenario from question two disproves both answers:
This diagram from question three disproves C. The telephone doesn’t have to go before landscaping:
This diagram from question five disproves E. Gas or satellite don’t have to go last:
That leaves A. It’s CORRECT. Since we thought A was right, and we eliminated the other answers, we can be very sure it’s right.
Just for fun, I’ll prove conclusively that A is true. We saw in the setup that Gas and Satellite had to be in spaces 4-6. So if something goes after gas and satellite, it must go last.
Therefore, saying that “T can’t go last” is the same as saying that “T must go before gas and satellite”.
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