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critical reasoning 4 compared animals

Expert replies
by Taniuca » Thu Aug 26, 2010 5:06 pm
Rats are generally more active than mice. But since gerbils are generally more active than hamsters, it follows that rats are generally more active than hamsters.

Any of the following, if introduced into the argument as an additional premise, makes the argument above logically correct EXCEPT:
Gerbils are generally more active than rats.
Mice are generally more active than hamsters.
Mice are generally more active than gerbils.
Mice and gerbils are generally equally active.
Rats and gerbils are generally equally active.
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Source: — Critical Reasoning |

by reply2spg » Thu Aug 26, 2010 5:13 pm
Only A must be the answer
Sudhanshu
(have lot of things to learn from all of you)
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by Taniuca » Thu Aug 26, 2010 5:25 pm
I need more detail of how you got the answer. tks!
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by beatthegmatinsept » Thu Aug 26, 2010 5:28 pm
Taniuca wrote:I need more detail of how you got the answer. tks!
Because A directly contradicts the conclusion
Being defeated is often only a temporary condition. Giving up is what makes it permanent.
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by reply2spg » Thu Aug 26, 2010 5:58 pm
Ok, so here we go

We know three things from the passage,

1. R (rats) > (More active than) M (Mice)
2. G > H

Therefore,

R > H

How can we prove this?

If we know 4 things we can prove this. What are those 4 things?

1. M > H
2. M > G
3. R = G
4. M = G

As per A

If you say that G > R then we don't know where exactly H lands?

H may be more active than R or may be less active.

Hope this helps!!!
Taniuca wrote:I need more detail of how you got the answer. tks!
Sudhanshu
(have lot of things to learn from all of you)
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