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JEE Main 201815 April
Exam
JEE Main
Year
2018
Date
15 April
Subject
Mathematics
Chapter
Mathematical Reasoning

JEE Main 2018 · 15 April · Mathematics · Mathematical Reasoning

If (p ∧ ~ q) ∧ (p ∧ r) → ~ p ∨ q is false, then the truth values of...

If (p∧ q)∧(p∧r)→ p∨q\left(p ∧ ~ q\right) ∧ \left(p ∧ r\right) \to ~ p ∨ q is false, then the truth values of p,qandrp, q and r are respectively

Options

  1. AT,T,TT, T, T
  2. BF,T,FF, T, F
  3. CT,F,TT, F, T
  4. DF,F,FF, F, F

Correct answer

C. T,F,TT, F, T

Step-by-step solution

Recall p⇒q≡Fp ⇒ q ≡ F if and only if T⇒F≡FT ⇒ F ≡ F

So, \left(p ∧ ~ q\right) ∧ \left(p ∧ r\right) \to ~ p ∨ q</p><p>TakingOption(A):(T∧F)∧(T∧T)→F∨T</p><p>Taking Option \left(A\right): \left(T ∧ F\right) ∧ \left(T ∧ T\right) \to F ∨ T

≡(F∧T)→T≡ \left(F ∧ T\right) \to T

≡F→T≡T≡ F \to T ≡ T

Hence, option \left(A\right)isfalse.</p><p>TakingOption(B):(F∧F)∧(F∧F)→T∨Tis false.</p><p>Taking Option \left(B\right): \left(F ∧ F\right) ∧ \left(F ∧ F\right) \to T ∨ T

≡F→T≡T≡ F \to T ≡ T

Hence, option \left(B\right)isfalse.</p><p>TakingOption(C):(T∧T)∧(T∧T)→F∨Fis false.</p><p>Taking Option \left(C\right): \left(T ∧ T\right) ∧ \left(T ∧ T\right) \to F ∨ F

≡T→F≡F≡ T \to F ≡ F

Hence, option \left(C\right)iscorrect.</p><p>TakingOption(D):(F∧T)∧(F∧F)→T∨Fis correct.</p><p>Taking Option \left(D\right): \left(F ∧ T\right) ∧ \left(F ∧ F\right) \to T ∨ F

≡F∧F→T≡ F ∧ F \to T

≡F→T≡T≡ F \to T ≡ T

Hence, option \left(D\right) is false.

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