Question: 1. Determine using the tree method whether the following argument is valid. If it is invalid, read off a countermodel from your tree. 7 1x(Gx

1. Determine using the tree method whether the following argument is valid. If it is invalid, read off a countermodel from your tree. 7 1x(Gx -+ Fx) 7Fb :. Gb 2. Determine using the tree method whether the following set of propositions is satisfiable. If it is satisfiable, read off from your tree a model on which all the propositions in the set are true. {( D W V PH ) L '*HL XA ' ( ITVL V XH) EL }

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