Determine Whether the Given Argument Is Valid or Invalid $\lor$

question 171

Essay

determine whether the given argument is valid or invalid. If it is valid, provide a derivation of the conclusion from the premises. If it is invalid, provide a counterexample.
-1. (∃x)[Ax • (Bx $\lor$ Cx)]
2. (∀x)(Bx ⊃ ∼Cx)
3. (∃x)Bx
4. Ca / (∃x)(Ax • Cx)

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