MathSyllogism valid?
posted by tony .
Some snakes are poisonous. A rattlesnake is a snake. Therefore: a rattlesnake is poisonous. Is syllogism valid or invalid?

MathSyllogism valid? 
PsyDAG
Although a rattlesnake is truly poisonous, you don't know in the syllogism if it is included in the "some snakes." Invalid syllogism.
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