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Find a model for each of the following wffs. a. ∃x (p(x) → q(x)) ^ ∀x...

Find a model for each of the following wffs.

a. ∃x (p(x) → q(x)) ^ ∀x ¬ p(x)      
          

b. ∃x ∀y p(x, y) ^ ∃x ∀y ¬ p(x, y)

c. ∃x p(x) ^ ∃x q(x) → ∃x (p(x) ^ q(x))

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