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1 . Determine using a tree whether the following argument is valid or invalid. If invalid, read off a countermodel from your tree. AAx (

1 .

Determine using a tree whether the following argument is valid or invalid. If invalid, read off a countermodel from your tree.

AAx

(n o t Q x P x)

EExnotPx

.

EExQx

Determine using a tree whether the following argument is valid or invalid. If invalid, read off a countermodel from your tree.

AAx

(n o t Q x P x)

EExQx

.

EExnotPx

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