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one question, 3x.

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楼主
发表于 2008-7-26 09:15:00 | 只看该作者

one question, 3x.

biologist: we know the following things about plant x. specimmens with fuzzy seeds always have long stems but never have white flowers. specimens with curled leaves always have white flowers, and specimens with thorny seedpods always have curlved leaves. a specimen of plant x in my garden has along stem and curlved leaves.

from the bio's statements, which one of the following can be properly inferred abou the specimen of plant x in the bio's garden?

the answer is it has white flowers but lacks fuzzy seeds.

can someone tell me why? thanks.

沙发
发表于 2008-7-28 01:51:00 | 只看该作者
Curlved leaves leads to white flowers, however white flowers excludes the possibility of fuzzy seeds

板凳
 楼主| 发表于 2008-7-28 20:18:00 | 只看该作者
but it says it has a long stem and curve leaves in garden?
地板
发表于 2008-7-29 07:04:00 | 只看该作者
fuzzy seed(fs)--->long stem(ls) + white flowers(wf) not = wf or ls not --->fs not.
curlve leaves(cl)--->wf
thorny seedpod(ts)--->cl--->wf

plant x ls + cl--->wf--->fs not.

Try digraming when you are deal with formal logic questions. Read Power Score Logic Reseaonging Bible.




5#
发表于 2008-7-29 23:00:00 | 只看该作者
long stem didn't make any contribution here.
6#
 楼主| 发表于 2008-8-1 06:02:00 | 只看该作者
thanks icewarm and salitis!!
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