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Q. Statement forms that have both true and false statements among their substitution instances are called ……………………………………………..

Q. The negation of (x) M x is logically equivalent to……………………………….

Q. “If a statement is true, then it is implied by any statement whatever” is symbolized as

Q. ‘p v q’ is false if p is ----- and q is --------

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

Q. Bi-conditional proposition is a ----- proposition

Q. In disjunction, two simple propositions are combined by ------

Q. Name the rule of inference ( P Ͻ q ) ≡ Q Ͻ P )

Q. A statement form that has only false substitution instance is said to be

Q. A _______________proposition is one which contains other proposition as it’s Component