Must be true is not the logical opposite of must be false.
Must Be True is equivalent to Cannot Be False. The opposite of Must Be True is Not Necessarily True. The opposite of Cannot Be False is Could Be False. Not Necessarily True is equivalent to Could Be False.
Could Be True is equivalent to Not Necessarily False. The opposite of Could Be True is Cannot Be True. The opposite of Not Necessarily False is Must Be False. Cannot Be True is equivalent to Must Be False.
Therefore, the logical opposite of must be false in this question is not necessarily false, as opposed to must be true.
Refer back to the video - Introduction to Logical Reasoning: True vs. False for more clarification.
Hope this is helpful! Please let us know if you have any further questions.
Starr-LatimerJuly 9, 2021
I'm really confused with this one because I feel like y'all change it sometimes it could be true in other times it's not necessarily true and you always say that it's the logical opposite of must be false so how do you know the difference between could be true and not necessarily true ?
LamontJanuary 17, 2022
I think I understand what your saying and it's because of the word "EXCEPT". The answer choices should give you some idea of the answer as well. When I see "EXCEPT" now I know to consider the polar opposite of "Must be False" is "Not Necessarily False" logically though the out of all the answers would be on the truth side the opposite of "Not Necessarily False" would be "Could be True" If the question asked: Each of the following must be false then? the answer would be the logical opposite of "Must be False" which is "Cannot be True." I hope I got that explained correctly and not confusing. Really, I mess up and use to do these drills at the end of my day I found I made many mistakes like not really knowing the argument, looking at the argument set up correctly, or even diagramming them correctly. Lastly, I did not read and understand the question stem clearly. Look go back to the intro to logical reading and do those exercises over until you got the rules and didactics down so you can see them in your mind's eye. That's is my goal. Please be well and do well.
LamontJanuary 17, 2022
For anyone who reads this post please work hard at getting the concept of true and false in the intricacies down from the beginning until you can recite them in the polar opposite and logical opposite the way LSATMax has presented them using the Yen and Yang as logical opposites and then the Yen and Yen, Yang Yang as logical opposites There approach by far exceeds all the explanations I have read or heard in the realm of really understanding the concepts.
Naryan-ShukleJanuary 18, 2022
Hey @Starr-Latimer, @Lamont,
Victoria's explanation does a great job with the core logic of Must Be True, Cannot be True, Must be False, etc. Here are a few more tips to help keep these concepts straight.
Whenever I'm going through questions like these, I always ask myself "What is it the LSAT is asking for?"
Must be True - this HAS to happen every time, it's impossible for this thing NOT to be true.
Now what would the opposite of this be? Well, something that doesn't have to happen every time.
Could be False/Not Necessarily True - This could happen, but doesn't need to happen every time. This is the opposite of what we would look for in ^^Must be True.
Then there's Cannot be True/Must be False - this is IMPOSSIBLE. There's no way this could ever happen under the rules/conditions/situation given.
In a question like this, where the right answer cannot be true, the wrong answers would be....
Could be True/Not Necessarily False - This thing IS possible. It doesn't have to be false—it COULD happen. It doesn't need to every time, but it could.
