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Which formal verification technique consists of a Boolean formula?

Which formal verification technique consists of a Boolean formula? Correct Answer Propositional logic

The propositional logic technique is having the boolean formulas and the boolean function. The tools used in propositional logic is the tautology checker or the equivalence checker which in turn uses the binary decision diagrams which are also known as BDD.

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interface Base{ boolean m1 (); byte m2(short s);}

which two code fragments will compile?
1. interface Base2 implements Base {}2. abstract class Class2 extends Base { public boolean m1(){ return true; }}3. abstract class Class2 implements Base {}4. abstract class Class2 implements Base { public boolean m1(){ return (7 > 4); }}5. abstract class Class2 implements Base { protected boolean m1(){ return (5 > 7) }}
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Which of the following problems is NOT NP-complete? I. Checking satisfiability of arbitrary Boolean formulae II. Checking satisfiability of Boolean formulae in conjunctive normal form (CNF/product of sums) III. Checking satisfiability of Boolean formulae in disjunctive normal form (DNF/sum of products)
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