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JEE Main 202312 AprilMorning Shift
Exam
JEE Main
Year
2023
Date
12 April
Shift
Morning Shift
Subject
Mathematics
Chapter
Mathematical Reasoning

JEE Main 2023 · 12 April · Morning Shift · Mathematics · Mathematical Reasoning

Among the two statements ( S _ 1 ): (p ⇒ q) ∧ (p ∧ (~ q)) is a...

Among the two statements

(S1):(p⇒q)∧(p∧( q))\left({S}_{1}\right): \left(p ⇒ q\right) ∧ \left(p ∧ \left(~ q\right)\right) is a contradiction and \left({S}_{2}\right): (p∧q)∨(( p)∧q)∨(p∧( q))∨(( p)∧( q))\left(p ∧ q\right) ∨ \left(\left(~ p\right) ∧ q\right) ∨ \left(p ∧ \left(~ q\right)\right) ∨ \left(\left(~ p\right) ∧ \left(~ q\right)\right) is a tautology

Options

  1. Aonly (S2)( {S}_{2} ) is true
  2. Bonly (S1)( {S}_{1} ) is true
  3. Cboth are false
  4. Dboth are true

Correct answer

D. both are true

Step-by-step solution

Given,

S1:(p⇒q)∧(p∧ q){S}_{1}: \left(p ⇒ q\right) ∧ \left(p ∧ ~ q\right)

≡( p∨q)∧(p∧ q){asA⇒B≡ A∨B}≡ \left(~ p ∨ q\right) ∧ \left(p ∧ ~ q\right)\left\{\text{as}A ⇒ B ≡ ~ A ∨ B\right\}

≡( p∧(p∧ q))∨(q∧(p∧ q))≡ \left(~ p ∧ \left(p ∧ ~ q\right)\right) ∨ \left(q ∧ \left(p ∧ ~ q\right)\right)

≡(f∧ q)∨(f∧p)≡ \left(f ∧ ~ q\right) ∨ \left(f ∧ p\right)

≡f∨f≡f≡ f ∨ f ≡ f

\left({S}_{2}\right): \left(p ∧ q\right) ∨ \left(\left(~ p\right) ∧ q\right) ∨ \left(p ∧ \left(~ q\right)\right) ∨ \left(\left(~ p\right) ∧ \left(~ q\right)\right)</p><p></p><p>≡ \left(p ∧ q\right) ∨ \left(~ p ∧ q\right) ∨ \left(p ∧ ~ q\right) ∨ \left(~ p ∧ ~ q\right)</p><p></p><p>≡ \left(\left(p ∨ ~ p\right) ∧ q\right) ∨ \left(\left(p ∨ ~ p\right) ∧ ~ q\right)</p><p></p><p>≡ \left(t ∧ q\right) ∨ \left(t ∧ ~ q\right) ≡ q ∨ ~ q ≡ t$

Hence, both statement are true.

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