P: X → CP: ?C: A–some–C

TashaPenwell February 28, 2017

Change variable in C

I don't understand these "some" questions. In the explanation the variables changed from what was in the question for "C". Thank you.

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Mehran March 1, 2017

@TashaPenwell not sure I am understanding your question here.

Can you please clarify? Thanks!

Also, for a more in-depth review of these concepts, please watch our video lesson on Quantifiers.

yasmeenalbader August 31, 2017

I think what he's saying is that the conclusion in the question "A-some-C" is not what's written and contraposed in the explanation of the conclusion (where it says "C: X-some-C"). I was a bit confused about that too

Mehran September 3, 2017

Hi! Thanks for your posts.

Let's consider each given statement, and its contrapositive (if applicable).

P1: X ==> C

CP: not C ==> not X

P2: [missing]

C: A-some-C

OR: C-some-A (Remember: no contrapositive here, and that "some" statements are reversible. Why? Because "some" means "at least 1." So if some As are Cs, then that means at least one C is an A, i.e., that some Cs are As)

All right, so let's look at answer choice (A).

P2: A-some-X [the missing premise]

OR: X-some-A

P1: X ==> C

Combined: A-some-X==>C

A-some-C [the given conclusion]