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Must Be X vs Cannot be true

General questions relating to LSAT Reading Comprehension.
 lathlee
  • Posts: 652
  • Joined: Apr 01, 2016
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-  Thu Jan 11, 2018 5:22 pm #42819
As I was going through some of the wrong questions that i got in the 2016 version of RC LSAT powerscore, I realized that the wording of Must be X and Cannot be true are pretty similar to possibly the same.

How can I distinguish the two?
also, in RC only, Must be X and Cannot be True questions' answers, Is the correct answer are basically the same ?
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 Dave Killoran
PowerScore Staff
  • PowerScore Staff
  • Posts: 5853
  • Joined: Mar 25, 2011
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-  Sat Jan 13, 2018 6:57 pm #42850
Hi Lathlee,

They aren't identical, but do overlap. Here's how:

Must Be True Except:

..... Incorrect answers: Must Be True
..... Correct answer: Not Necessarily True (which includes Cannot Be True)

Cannot Be True:

..... Incorrect answers: Could Be True
..... Correct answer: Cannot Be True

So, the two aren't identical. In the LRB, look up the discussion of the Logical Opposition (LGB has it too). These ideas are covered in detail there!

Thanks!
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