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b. (VX)P(X) VEXQx) (Vx)[P(x) VAX) 36. Decide whether each of the following wffs is valid or invalid. Justify your answer. a. (Vx)A(x) + ((Ex)[A(x)]')' b.

b. (VX)P(X) VEXQx) (Vx)[P(x) VAX) 36. Decide whether each of the following wffs is valid or invalid. Justify your answer. a. (Vx)A(x) + ((Ex)[A(x)]')' b. (Vx)[P(x) Q(x)] ^ (3x)[P(x) V Q(x)] (3x)[P(x) ^ Q(x)] c. (Vx)[P(x) V Q(x)] (Vx)P(x) V yg(y)

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