All flies are winged creatures.
All butterflies are winged creatures.
Therefore, all butterflies are flies.
Is this an invalid or valid syllogism?© BrainMass Inc. brainmass.com June 20, 2018, 10:49 pm ad1c9bdddf
Invalid. The category of winged creatures can include both all flies and all butterflies without these classes ...
Syllogisms are assessed in terms of validiity.