Which one of the following statements most accurately characterizes a difference between the two passages?

ca29rlegrand on October 31, 2018

Can be false

Why is it important to differentiate between could be false and must be false? If each logical reasoning question only has one correct answer, why is could be false even an option?

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Jacob-R on October 31, 2018

Thanks for your question. False used in this context does not necessarily mean that the answer is wrong. It instead means that, given the passage at issue, a given answer choice could or must be false.

Here is an example. Let’s say that the question prompt states: There is a gum ball machine with only red and blue gum balls. When one puts a coin in the machine, a single gum ball comes out.

If the question stem is which of the following COULD be false, and one of the possible answers is

If you put a coin in the machine, you have a 50/50 chance of getting a red or blue gum ball.

Then we have an example of an answer that COULD, but not must, be false. The reason for this is that although we know the two gum ball colors, we don’t know the ratio of gum balls in the machine. Therefore, while it could be true that you have a 50/50 chance, it also could be false (if, for example, there were 9 blue gum balls and 1 red one.)

But it is not the case that this answer must be false, because we don’t know the actual ratio of gum balls.

I hope this helps! Please let us know if you have further questions.

ca29rlegrand on November 10, 2018

It helps! Thanks

ative on January 4, 2019

It's there're any practice further on the prep course to apply the True V. False lesson ? If there is any, please guide me to the section.

Ravi on January 5, 2019

Hey there,

Regarding whether there is any additional practice in the prep course
to apply the content from the True v. False lesson:

Yes, there is. If you go back to main curriculum page, you'll see that
there are 'Must Be True' and 'Cannot Be Trus' sections. Both of these
sections have extensive video lessons as well as many examples where
you can continue to apply what you've learned.

Does this help? Let us know if you have any other questions!

ative on January 24, 2019

Hi, I'm having a little bit of difficulty with the sufficient necessary conditioning, and I want to know if there is help such one of use tutoring ?

Ravi on February 13, 2019


Thanks for your inquiry. We do have private tutoring sessions
available. For more information, please contact us through email
(info@testmaxprep.com), or you can chat with our sales team through
the chat function on the website. You can also call 855.483.7862 ext.
2 Monday-Friday 9am-6pm PT.

In the meantime, I'm happy to go over sufficient and necessary
conditions with you. Also, please take advantage of our curriculum and
the accompanying lessons. In particular, if you haven't viewed them
already, the videos covering sufficient and necessary conditions (and
conditional logic) are very helpful.

S - >N

Above is the general diagram that denotes a conditional statement. The
"S" stands for sufficient and the "N" stands for necessary. The
sufficient condition is the condition that, if met, triggers the
necessary condition. The necessary condition is the condition that
must occur if the necessary condition is met.

The contrapositive of S - >N is

/N - >/S

What does this mean? It's a deduction we can make based on S - >N

If the necessary condition MUST occur if the sufficient condition is
met, then what happens if the necessary condition doesn't occur? Well,
if it doesn't occur, then the sufficient condition MUST NOT occur.

/N - >/S

Does this help? Let us know if you have any more questions, and also
let us know if you're interested in private tutoring!