Join WhatsApp Icon JEE WhatsApp Group
Question 59

The proposition $$p \to \sim(p \wedge \sim q)$$ is equivalent to:

We have to simplify the proposition $$p \to \sim(p \wedge \sim q)$$ and then compare the final result with the four given options.

First recall the logical equivalence for an implication. The standard formula is:

$$a \to b \equiv (\sim a) \vee b.$$

In our problem the role of $$a$$ is played by $$p$$ and the role of $$b$$ is played by $$\sim(p \wedge \sim q).$$ Substituting into the formula we obtain

$$p \to \sim(p \wedge \sim q) \equiv (\sim p) \vee \bigl[\;\sim(p \wedge \sim q)\bigr].$$

Now we tackle the term $$\sim(p \wedge \sim q)$$. To simplify a negation of a conjunction, we use De Morgan’s law, which states:

$$\sim(A \wedge B) \equiv (\sim A) \vee (\sim B).$$

Here $$A$$ is $$p$$ and $$B$$ is $$\sim q$$. Applying the law carefully gives

$$\sim(p \wedge \sim q) \equiv (\sim p) \vee \bigl[\sim(\sim q)\bigr].$$

A double negation disappears, because $$\sim(\sim q) \equiv q$$. Hence the entire right-hand side becomes

$$\sim(p \wedge \sim q) \equiv (\sim p) \vee q.$$

We now substitute this back into the expression we obtained after the implication step:

$$(\sim p) \vee \bigl[\;\sim(p \wedge \sim q)\bigr] \equiv (\sim p) \vee \bigl[(\sim p) \vee q\bigr].$$

The disjunction is associative and idempotent, meaning that repeating the same statement inside a string of ORs does not change the result. Explicitly,

$$ (\sim p) \vee (\sim p) \equiv \sim p, \quad\text{and}\quad (\sim p) \vee \bigl[(\sim p) \vee q\bigr] \equiv (\sim p) \vee q.$$

Therefore the original proposition simplifies all the way down to

$$p \to \sim(p \wedge \sim q) \equiv (\sim p) \vee q.$$

This final expression matches exactly what is written in Option B. Hence, the correct answer is Option B.

Get AI Help

Create a FREE account and get:

  • Free JEE Mains Previous Papers PDF
  • Take JEE Mains paper tests

JEE Quant Questions | JEE Quantitative Ability

JEE DILR Questions | LRDI Questions For JEE

JEE Verbal Ability Questions | VARC Questions For JEE

Free JEE Topicwise Questions

JEE Rotational MotionJEE Units & MeasurementsJEE Atomic StructureJEE GravitationJEE Periodic Table & PeriodicityJEE StatisticsJEE Inverse Trigonometric FunctionsJEE Magnetism & Magnetic MaterialsJEE Sequences & SeriesJEE MatricesJEE Alternating CurrentsJEE Carboxylic AcidsJEE Permutations & CombinationsJEE Work, Energy & PowerJEE Electromagnetic InductionJEE Electronic DevicesJEE d and f-Block ElementsJEE Chemical KineticsJEE Heat TransferJEE Three Dimensional GeometryJEE Magnetic Effects of CurrentJEE Hydrocarbons - AromaticJEE Electromagnetic WavesJEE Aldehydes & KetonesJEE Hydrocarbons - AlkanesJEE Applications of DerivativesJEE EquilibriumJEE Indefinite IntegrationJEE Chemical ThermodynamicsJEE ElectrochemistryJEE ProbabilityJEE BiomoleculesJEE Continuity & DifferentiabilityJEE Kinetic Theory of GasesJEE Vector AlgebraJEE Hydrocarbons - AlkynesJEE Differential EquationsJEE Current & ResistanceJEE Straight LinesJEE WavesJEE Redox ReactionsJEE Hydrocarbons - AlkenesJEE DeterminantsJEE SolutionsJEE Ray OpticsJEE Dual Nature of Matter & RadiationJEE Chemical Bonding & Molecular StructureJEE Complex NumbersJEE Sets, Relations & FunctionsJEE Electric Charges & FieldsJEE Laws of MotionJEE Fluid MechanicsJEE Basic Concepts in ChemistryJEE Trigonometric FunctionsJEE LimitsJEE Laws of ThermodynamicsJEE Kinematics - 2D MotionJEE p-Block Elements (Groups 13-18)JEE Simple Harmonic MotionJEE Electric Potential & CapacitanceJEE Coordination CompoundsJEE JEE 2D GeometryJEE CirclesJEE Definite IntegrationJEE EMF & Circuit AnalysisJEE Surface TensionJEE Atoms & NucleiJEE Laboratory Experiments - XIJEE Number SystemJEE Basic Principles of Organic ChemistryJEE Wave OpticsJEE Quadratic EquationsJEE Alcohols, Phenols & EthersJEE Organic Compounds with HalogensJEE DifferentiationJEE Conic SectionsJEE Nitrogen-Containing CompoundsJEE ElasticityJEE Practical Organic ChemistryJEE Kinematics - 1D MotionJEE Purification & CharacterisationJEE Binomial Theorem
Ask AI