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Q. An invalid argument form is one that has at least one substitution_________ with true premises and a false conclusion

Q. If (∃ x ) Mx is true , then x) Mx is …………………

Q. If A is true, X is false , then the truth value of the compound statement (~A v ~X)

Q. A statement or statement form of the pattern p ≡ q is called ----

Q. If (x) Mx is false, then (∃x ) Mx is …………………..

Q. Quantification logic is also called………………………………………

Q. In Conjunction if p is true and q is false, p . q is --------

Q. Name the rule of inference P ≡ q ) ≡ [ p . q ) v P . Q ) ]

Q. . If B is true, Y is false , then the truth value of the compound statement (~B . ~Y)

Q. The statement form p ↄ q is logically equivalent to