Question: a. Use refutation trees to determine whether the argument below is valid or invalid. b. Use refutation trees to determine whether the following is a

a. Use refutation trees to determine whether the argument below is valid or invalid.

a. Use refutation trees to determine whether the argument below is valid

b. Use refutation trees to determine whether the following is a tautology. If it is not a tautology, check to see whether it is a contradiction.

or invalid. b. Use refutation trees to determine whether the following is

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