Question: [5 marks] 1. Using the semantic tableau method for predicate logic, prove that the following closed formula is valid: (3rA(x) - VxB(x)) - VI(A(c) -

[5 marks] 1. Using the semantic tableau method for predicate logic, prove that the following closed formula is valid: (3rA(x) - VxB(x)) - VI(A(c) - B(x))

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