True v False-EXCEPT

I am curious about the last two questions concerning EXCEPT. In the question, "Each of the following could be false EXCEPT:" Why is the answer "Must Be True" and not "Cannot Be False"? If MBT and CBF are equivalent, couldn't the answer be either of the two?

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cfrazier August 24, 2019

I have the same question.

mg123 August 25, 2019

haha right it is a little confusing, i just wonder if the two logical equivalents are interchangeable and if not, why?

Victoria August 25, 2019

Hi @mg123 and @fraziercbf

You are absolutely correct! 'Must Be True' and 'Cannot Be False' are equivalent and interchangeable. The reason that the video answers the questions with true is because, for most people, it is easier to comprehend and answer questions in terms of true as opposed to false. If this is not the case for you, 'Cannot Be False' is equivalent to 'Must Be True' and is a correct way to interpret and answer the question.

Hope this helps! Please let us know if you have any further questions.