(2) Some B are C.
Which of the following is true?
(A) All A are C.
(B) No A are C.
(C) Some A are C.
(D) No C are A.
(E) None of the above.
Solution:
Venn diagrams are one way we can keep track of this type of information.
Let's examine the two rules we have:
(1) all A are B.
From this, we know that if something is A, it's also B.
(2) Some B are C.
From this, we know that there's at least one B that's also C.
If we put the two statements together, we don't know anything for sure. Could some A also be C? Sure, but it's not definite.
Let's use a real-life example to make that clear:
All Dogs are Mammals.
Some Mammals are Cats.
Does this mean that some dogs are cats? Of course not!
Link to the actual post: http://www.beatthegmat.com/cr-question-t9070.html
4 comments:
Glad to see I'm not the only geek actually taking the time to explain problems in my blog.
You are welcome. Actually I thought of making unsolved or difficult questions offline logbook for myself in the word. Then I thought why should not I publish it, so including me anyone can access it from anywhere.
Though I am bit offtrack from past few days but today I am getting free and from tomorrow getting on the track.
Your strengths & weakness are almost similar to mine - propose that we share the plan & progress - would be helpful for both of us
hmm... you can mail me...
EmailID: btg760 at gmail.com
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